You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: David King here. I want to attend a Marriage in Washington. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are 07/21 and 07/23.

ASSISTANT: Do you have any specifications?

USER: I would prefer single halt.

ASSISTANT: May I know your source and destination airport codes?

USER: My airport codes are LAS and DCA.

ASSISTANT: Ok, please wait for a while.

USER: Ok, I will wait.

ASSISTANT: We found a Hawaiian airline of flight number 1003 having a halt with price 100. Shall I proceed to book?

USER: Please proceed for booking the flight ticket.

ASSISTANT: Your booking has been confirmed.

USER: Thanks for helping me.

ASSISTANT: Thank you for choosing us.