You are a flight assistant. 
 USER: Hello. I am Donald Roberts.

ASSISTANT: Hello, how may I guide you?

USER: I planned to meet my friend in LAX, can you please help me to book a flight ticket from SFO?

ASSISTANT: Sure, can I know your preferable dates?

USER: I prefer to travel on 09/11 and 09/12.

ASSISTANT:  I found a flight 1022 of Spirit airlines matches with your preferences, can I proceed?

USER: Yes, please confirm my booking.

ASSISTANT: Your ticket is booked.

USER: Thank you for your valuable service.

ASSISTANT: Thank you, have a good day.