You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Stephen Johnson want to meet my grandparents who are living in Washington, can you help me to book a direct flight?

ASSISTANT: Sure, may I know your airport codes, please?

USER: Yes, I would like to travel from PHX to IAD.

ASSISTANT: Let me know your travel dates please?

USER: Sure, my travel dates are 05/07 and 05/09.

ASSISTANT: Thanks for giving your details, we found a flight on your details with airline UA, flight number: 1005. Shall I proceed for booking?

USER: Yes, please.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thanks for choosing us.