Rachel: Well, you don't look like a bodyguard.
Frank: What'd you expect?
Rachel: Well, I don't know, maybe a tough guy?
Frank: This is my disguise.
Rachel: So, can we get you anything?
Frank: Yeah, orange juice.
Rachel: Straight?
Rachel: But I can't go out on a date because you have to be with me every minute. I mean, what if he wants to invite me up to his place afterwards? Are you gonna come too?
Rachel: Will you grab that jacket for me? The red one, please?
Frank: I'm here to keep you alive, not help you shop.
Rachel: And you're ready to die for me?
Frank: It's the job.
Rachel: And you'd do it? Why?
Frank: I can't sing.
Fletcher 'Fletch' Marron: What are you afraid of?
Frank: I'm af - I'm afraid of not being there.
Frank: I don't want to talk about this again.
Frank: This house is wide open.
Sy Spector: Excuse me?
Frank: I said this house is wide open and you people have no clue what real security is or what it takes to achieve it.
Rachel: You afraid I might get picked off in my snazzy running suit?
Frank: No, I'm afraid that I might have to jog with you.
Frank: It's Portman, the guy from Miami.
Tony: Right, pencil neck?
Frank: You're too old to be this naive .
Rachel: I don't trust discipline. I know, at that crucial moment, I'd cop out.
Frank: This is the night.
Frank Farmer: We're adding to your duties. You're my new assistant.
Henry: Says who?
Frank Farmer: Henry, I've spent a lot of time guarding people all over the world, and I've found one thing to be true - no matter how incompetent the assassins, no matter how much they miss their target, there's always one person who always gets hit.
Henry: Who?
Frank Farmer: The cocky black chauffeur.
Answer: The fact that Frank hires an older gray haired bodyguard for Rachel after he quit tells me that he didn't want her getting involved with another man, because his intention was that he would be involved with her.
You should read the script; some of the deleted scenes mention the part where she slaps him and why, and the ending when she gets back off the plane. They talk and she gives him a cross.