You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you?

USER: I am Kenneth Lee. I would like to book a flight ticket to Washington DC-DCA to watch a national football match in arena, could you help me in booking?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: may I know from which airport are you planning to depart?

USER: I want to board from SEA.

ASSISTANT: Ok, please share me your preferable dates to travel.

USER: I want to travel on 05/20 and need to catch return flight on 05/22.

ASSISTANT: Is there any restriction in price?

USER: Price is 500.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is a connecting flight in Spirit airline at a fare of 100 only. Shall I proceed in flight 1009?

USER: Proceed with the booking.

ASSISTANT: Your booking has been done in business class.

USER: Thanks for the help.

ASSISTANT: Thank you for making us to serve you.