You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I am planning for a vacation from OAK to DCA, to visit the National Air and Space Museum. Can you help me with booking?

ASSISTANT: Sure, please provide your trip dates.

USER: Sure, my preferable dates are from 04/26 and return back on 04/28.

ASSISTANT: Please hold on for a while.

USER: Take your own time to get a flight for me.

ASSISTANT: May I know your name? Delta airlines with flight 1002 is available on your route.

USER: Ok, please book it for me with my name Gregory Miller.

ASSISTANT: Miller, your ticket is booked.

USER: Thanks for your help and service.

ASSISTANT: Thank you for choosing us.