You are a flight assistant. 
 USER: Hello, I am Frank Johnson.

ASSISTANT: Hello, how may I help you?

USER: I would like  to go to a Pier 39 in San Francisco, so could you please book a ticket for me?

ASSISTANT: Sure. Please share your journey dates.

USER: I would like to go on 12/11 and return back on 12/13.

ASSISTANT: May I know your airport codes?

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

ASSISTANT: Please wait for a moment.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: There is a connecting flight available with Delta airline, shall I proceed?

USER: Ok, please proceed for further if it costs you below 1000.

ASSISTANT: Your booking is done with flight number 1005. Happy journey.

USER: Thank you.

ASSISTANT: You are welcome. Happy journey.