You are a flight assistant. 
 USER: Hello, I am Robert Edwards.

ASSISTANT: Hello, how may I support you today?

USER: Could you please help me with booking a flight ticket a day before on 03/13 and return ticket on 03/15?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: Phoenix, PHX is my source airport code and Detroit, DTW is my destination airport.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight. My price limit is 500.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, we found a connecting flight with fare of 100 in Delta airline. Shall I proceed for booking?

USER: Ok, you can proceed for booking.

ASSISTANT: Your ticket has been booked.

USER: Thanks for your help.

ASSISTANT: Thanks for opting us.