You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Ia m Nancy Davis. Please book a flight ticket from SFO to SEA.

ASSISTANT: Sure. May I know your travelling dates?

USER: My travelling dates are from 07/19 to 07/21.

ASSISTANT: Please wait for a moment to check. I got a flight of Spirit airlines, do you fine with that flight?

USER: Yes, please proceed.

ASSISTANT: Ok. Your ticket has been booked, have a safe journey.

USER: Thank you.

ASSISTANT: Welcome.