You are a flight assistant. 
 USER: Hello. I am Gary Hill.

ASSISTANT: Hello, how may I aid you today?

USER: I am planning to visit a Golden Gate Bridge in San Francisco, so please book a flight ticket from IL - ORD to CA - SFO.

ASSISTANT: Sure, may I know your journey dates?

USER: My departure day is 03/21, return day is 03/23.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: We found a flight on spirit airline, flight  number as 1003 with the fare of 100. Can I reserve?

USER: You can reserve it.

ASSISTANT: Your ticket has been been reserved.

USER: Thank you.

ASSISTANT: Thank you for availing us.