You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Jason Hernandez here. I want to attend a Marriage in Houston. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: My travelling dates are 02/18 and 02/20.

ASSISTANT: May I know your nearby airport codes?

USER: My airport codes are DCA and HOU.

ASSISTANT: Do you have any preferences?

USER: I would prefer single halt.

ASSISTANT: There is a flight available with AA airline, shall I proceed?

USER: Please proceed for booking the flight ticket.

ASSISTANT: Your booking is done with flight number 1018. Happy journey.

USER: Thanks for helping me.

ASSISTANT: You are welcome, have a nice day.