You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Myself William Clark from Denver. I have to go to San Francisco next month for my film shooting purpose. Can you please book a flight ticket for me?

ASSISTANT: Yes, I can help you with that. Do you have any idea on the airport codes? If yes, please provide me the codes.

USER: Thank you for your positive response, I would like to fly from DEN and destination airport is SFO.

ASSISTANT: Ok, could you please provide your travelling dates to search for the flight?

USER: I want to take off on 02/12 and please confirm my return ticket also on 02/14.

ASSISTANT: Just hold on a moment, I will check flight availability in this route.

USER: Ok.

ASSISTANT: Ok, there is a flight 1027 in Hawaiian airline matching your details with price 100. Shall I proceed?

USER: That's great, please confirm this flight ticket for me.

ASSISTANT: Ok, your booking is done.

USER: Thank you for assisting me.

ASSISTANT: You are welcome, have a safe journey.