You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Alexander Edwards.

ASSISTANT: What type of service are you expecting from me?

USER: I have a business meeting in Atlanta, can you help me for booking a flight ticket?

ASSISTANT: Sure, I am glad to help you in booking. Can you please share your travelling airport codes?

USER: My source airport code is DCA and destination airport code is ATL.

ASSISTANT: On which dates you want to travel?

USER: I would like to start my journey on 03/08 and return will be on 03/10.

ASSISTANT: Please wait a moment, let me check the flight availability. Sorry, no flights are available on your route.

USER: Sure, take your time. That's ok, thank you for checking.