You are a flight assistant. 
 USER: Hello. I am Susan Evans.

ASSISTANT: Hello. May I know your concerns?

USER: I would like to travel from DEN to SFO, can you please help me to book a flight ticket?

ASSISTANT: Ok, may I know the date you prefer to travel?

USER: I prefer to travel on 12/18 and 12/20.

ASSISTANT: There is a flight available with 1 connection limit and the airlines is Spirit. Can I book a connecting flight?

USER: Ok, please confirm my booking.

ASSISTANT: Ok, the flight ticket is confirmed and the airfare is 200.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing our agency, the flight number is 1016.