You are a flight assistant. 
 USER: Hello, I am Mark Smith.

ASSISTANT: Hello, how may I assist you?

USER: I want to visit Washington, can you help me with reservation?

ASSISTANT: Sure, can you please provide your travel dates?

USER: OK, my depart is on 09/21 and return on 09/23.

ASSISTANT: Kindly, mention your travel dates.

USER: My origin is BOS and destination is DCA.

ASSISTANT: Thank you for providing your details.

USER: OK.

ASSISTANT: Please wait for a while, I will check and revert you.

USER: Sure.

ASSISTANT: Sorry there were no flights found matching your requirements.

USER: No issues. Thank you, for the information.

ASSISTANT: Thank you for opting us, have a good day.