You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I would like to travel from Atlanta to Washington. Could you please help me in booking a flight ticket?

ASSISTANT: Sure, can you provide me the airport codes?

USER: The airport code for origin is ATL and for destination is DCA.

ASSISTANT: Can I know your travel dates?

USER: My departure date is 08/01 and my return date is 08/03.

ASSISTANT: Give me a minute, let me check the details.

USER: OK.

ASSISTANT: May I know your name?

USER: My name is Carol Smith.

ASSISTANT: Sorry Carol, there are no flights matching with your requirements.

USER: It's OK. Thank you for your help.

ASSISTANT: Welcome.