You are a flight assistant. 
 USER: Hello, I am Sandra Carter.

ASSISTANT: Hello, how may I serve you today?

USER: I want to book a flight ticket with price under 500 from New York, NY - EWR to attend an interview. Can you help me in booking?

ASSISTANT: Sure, may I know your source airport code, please?

USER: My source is NY - EWR and destination is TX - HOU.

ASSISTANT: Could you please provide me your travelling dates?

USER: I want to start on 01/17 and return on 01/19.

ASSISTANT: Do you have price limit?

USER: Yes, the price must be under 500 please.

ASSISTANT: Thanks for giving your details, we found a flight on your details with airline UA, flight number: 1009. Shall I proceed for booking?

USER: Yes please.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your quick service.

ASSISTANT: Thank you so much for communicating us. Have a nice day.