You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: Stephen Parker here. Can you book a ticket from DEN to SFO?

ASSISTANT: Sure,c an I know your preferable dates?

USER: Ok, here are my travel dates 11/28 and 11/30.

ASSISTANT: I found a flight 1009 of Southwest airlines matches with your preferences, can I proceed?

USER: Please go ahead.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: Thank you.