You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER:  I want to book a flight ticket to attendInternational Auto Show, they are exhibiting more than 400 vehicles from many branded companies. Can you help me?

ASSISTANT: Sure, we are glad to help you. May I know your trip dates?

USER: Sure, 07/27 and 07/29 are my travelling dates.

ASSISTANT: Ok, can I have your name please?

USER: I am Gary Parker.

ASSISTANT: Please share me your airport abbreviates.

USER: DCA and LAX are my airport codes.

ASSISTANT: Please allow me to check the availability of flights.

USER: Ok.

ASSISTANT: Thank you for waiting, we have a flight with single halt at a price 100 from Southwest airline. Shall I proceed with flight 1012?

USER: You can reserve it.

ASSISTANT: Your reservation has been done.

USER: Thank you.

ASSISTANT: Thank you for choosing us.