You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to go Denver for meeting my childhood friends there, can you please book a flight ticket from DEN to DEN?

ASSISTANT: Sure, may I know your travelling dates please?

USER: My departure date is 12/01 and also confirm my return ticket also on 12/03.

ASSISTANT: Can I have your good name please?

USER: Sure, my name is Frank Hall.

ASSISTANT: Hawaiian airlines is having a flight with travel charge of 200, shall I proceed booking?

USER: Oh! That's great, my budget limit exactly match, please confirm this flight ticket for me.

ASSISTANT: Your ticket has been booked with flight-1000, have a safe journey.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.