You are a flight assistant. 
 USER: Hello, I am David Parker.

ASSISTANT: Hello, how can I assist you?

USER: I would like to visit Twin Peaks at San Francisco, can you please book me a ticket?

ASSISTANT: Sure. May I know your airport codes?

USER: Sure, my preferable airport codes are from LAX to SFO.

ASSISTANT: Do you have any connection limit? Can you please provide the trip dates?

USER: Sure, my trip dates are from 11/10 to 11/12.

ASSISTANT: Is there any price limit?

USER: Yes, I can afford 200.

ASSISTANT: We found a flight with Hawaiian airline with flight number:1003. The fare is 100 with a single connection.

USER: Ok, please book this ticket.

ASSISTANT: Your ticket has been reserved.

USER: Thanks for your help.

ASSISTANT: Thank you for opting us.