You are a flight assistant. 
 USER: Hello, I am Barbara Moore.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight ticket from Denver to Washington to meet my grand parents, can you help me with booking?

ASSISTANT: Sure, may I know your depart and return dates?

USER: My depart and arrival dates are Oct 27 and Oct 29.

ASSISTANT: Can you please share your source and destination airport codes?

USER: My source and destination airport codes are DEN to DCA.

ASSISTANT: Do you have any requirements?

USER: Yes, I need a connecting flight.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We found an UA airline, flight number: 1004, price: 200 with one connection.

USER: Please proceed with booking.

ASSISTANT: Your flight ticket has been confirmed in economy class.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing us.