You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Deborah Evans. I want to gather my old documents at San Francisco, SFO, can you please help me to book a flight ticket?

ASSISTANT: Sure, will you help me with your source point?

USER: My source point is Detroit, DTW.

ASSISTANT: May I know your travelling dates?

USER: I have planned to travel on 02/24 and 02/26.

ASSISTANT: We found a flight southwest airline, flight number as 1004 with the fare of 200. Shall I proceed?

USER: Ok, please book this ticket.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for opting us.