You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Christopher Williams. I need to book a flight ticket from DEN to DCA, can you please help me for booking?

ASSISTANT: Sure, Please help me with your travel dates.

USER: I would like to travel on 01/11 to 01/13.

ASSISTANT: We have found a direct flight from UA airline. Shall I proceed?

USER: No, don't  proceed for booking.

ASSISTANT: Ok.

USER: Thanks for your information.

ASSISTANT: Thank you for opting us.