You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: As there is an appointment with Central Intelligence Agency in Washington, so I would like to travel from ATL to DCA,.

ASSISTANT: Great to hear this, when you are going to travel?

USER: My journey dates are from 11/18 to 11/20.

ASSISTANT: Sorry to say this, no flights as per your details.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: My name is Gregory Green.

ASSISTANT: Have a pleasant day.

USER: Thank you.