You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Frank Wright.

ASSISTANT: How can I help you today?

USER: I would like to go to a event in San Francisco, so could you please book a ticket to San Francisco?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your planning dates of journey?

USER: Sure, I would like to go on 05/23 and return back on 05/25.

ASSISTANT: Ok, may I know your airport codes?

USER: My source and destination airport codes are IAD and SFO.

ASSISTANT: Flight 1005 in AA airlines is available for you with 1 stopover and it costs you 100. Shall I proceed?

USER: Ok, please proceed for further.

ASSISTANT: Your booking is done.

USER: Thank you for booking.

ASSISTANT: Thank you for reaching us, have a safe flight.

USER: Welcome.