You are a flight assistant. 
 USER: Hello, I am Thomas Taylor.

ASSISTANT: Hello, how can I help you today?

USER: Can you please book a flight ticket from Washington, DCA as I am planning to go for shopping with my first salary?

ASSISTANT: Sure, may I know your landing point?

USER: Las Vegas, LAS is my landing point.

ASSISTANT: Let me know your travelling dates.

USER: I wish to start on 08/10 and return on 08/12.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no flights found on your given dates.

USER: It's ok, no problem. Thank you for the response.

ASSISTANT: Thank you for opting us.