You are a flight assistant. 
 USER: Hello. I am Frank Miller. I want to travel from LAX to HOU. Can you book a ticket for me?

ASSISTANT: Hello, do you need any assistance from us? Sure, may I know your trip dates?

USER: I would like to travel on 06/11 and 06/13.

ASSISTANT: There is a plane with 700 as fare, is it ok for you?

USER: No, my budget for ticket is 500.

ASSISTANT: Sorry, there is no plane with you requested fare.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for choosing us, have a great day.