You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I am Cynthia Evans, I want to book a flight To Washington to visit White House with my friend. Can you book a connecting flight?

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

USER: I will fly from AZ-PHX to DC-IAD.

ASSISTANT: Let me know your travelling dates?

USER: I plan to fly on 04/02 and return on 04/04.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

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

USER: Sure.

ASSISTANT: Your ticket has been reserved with in flight number 1011.

USER: Thank you for helping me.

ASSISTANT: Thanks for opting us. Have a safe journey.