You are a flight assistant. 
 USER: Hello, I am Mark Mitchell.

ASSISTANT: Hello, how can I aid you today?

USER: Can you help me booking a flight ticket from DEN to IAD?

ASSISTANT: Sure, we are here to help you. Kindly mention your travel dates.

USER: Thank you. I will start on 12/26 and return on 12/28.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: There is a flight with your requirement, airline is UA with price 100 and single connection. Shall I proceed with booking?

USER: Please proceed with the booking.

ASSISTANT: Your booking is done.

USER: Thank you for your kind service.

ASSISTANT: Thanks for reaching us.