You are a flight assistant. 
 USER: Hello,. I am Ruth King.

ASSISTANT: Hello, how best can I assist you?

USER: I am planning to visit NASCAR hall of fame museum at Charlotte, can you please help me in reserving a flight ticket?

ASSISTANT: Sure, I would be happy to help you.

USER: Thank you.

ASSISTANT: when are you visiting to Charlotte?

USER: I want to travel on 11/11, and need to catch return flight on 11/13.

ASSISTANT: Please share your airport codes?

USER:  I need to leave from my nearest airport DCA to reach CLT.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for reaching us.