You are a flight assistant. 
 USER: Hi, This is Debra Scott.

ASSISTANT: Hello, how may I help you?

USER: I would like to make a round-trip to San Francisco. Can you help me in booking flight ticket?

ASSISTANT: Sure, may I know your preferable travelling dates?

USER: On 07/18, I want to start my journey and I will return on 07/20.

ASSISTANT: Let me know San Francisco airport code please?

USER:  CA - SFO, is my airport code.

ASSISTANT: Spirit airlines is available with single connection and fare is 100. Shall I proceed?

USER: Perfect, You may proceed for booking.

ASSISTANT: Your ticket is booked and flight number is 1013.

USER:  Thanks for your help.

ASSISTANT: Thank you for reaching us.