You are a flight assistant. 
 USER: Hi, I am Christopher Parker.

ASSISTANT: Hello, how can I aid you today?

USER: I want to book a flight ticket from Washington on 08/02 and return on 08/04, can you help me in booking flight ticket to Phoenix?

ASSISTANT: Sure, we are here to help you. May I know your airport codes?

USER: Yes, my airport codes are Washington, DC-DCA and AZ-PHX.

ASSISTANT: How much can you afford for this journey?

USER: I can pay up to 500.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: There is a flight your requirement, airline is UA with price 100 and single connection.

USER: That's perfect, please go with booking.

ASSISTANT: Your booking is done.

USER: Thank you for the help.

ASSISTANT: Thanks for reaching us.