You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning to attend a Tennis competition Denver DEN from IAD. Can you find a flight ticket for me?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: Ok, my planned trip dates are on Jan 27 and return on Jan 29.

ASSISTANT: Do you have any other preferences?

USER: I need a single connecting flight.

ASSISTANT: I have found an economy class ticket with a price of 200 and 1 connection.

USER: Ok, you can proceed with the ticket booking.

ASSISTANT: Can I know your name for booking?

USER: Ok, I am Nancy Wright.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for contacting us.