You are a flight assistant. 
 USER: Hello, my name is Matthew Moore.

ASSISTANT: Hello, how can I help you?

USER: I would like to book a flight to DC-IAD from GA-ATL.

ASSISTANT: Can you please provide me your journey dates?

USER: My travelling dates are from 12/25 to 12/27.

ASSISTANT: Please wait for a moment, I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting. Sorry, there is no flights found with your given details.

USER: Thanks for the information.

ASSISTANT: Thanks for choosing us.