You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Dennis Jones here. I am planning to attend my brother's anniversary function.

ASSISTANT: Oh! great.

USER: I need your help in booking the ticket from SEA to IAD.

ASSISTANT: Sure, may I know your travel dates?

USER: My preferable dates are from 05/09 to 05/11.

ASSISTANT: There is a flight available in UA airline as per your details, shall I proceed with the booking.

USER: Proceed my booking by mentioning flight number.

ASSISTANT: Sure, give me a moment. Your flight is booked with the flight number 1002.

USER: Thank you for your support.

ASSISTANT: Thank you for contacting us.