You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Is this flight ticket booking agency?

ASSISTANT: Yes, this is flight ticket booking agency. How can I assist you?

USER: I like to visit Billy Graham Library it is in Charlotte, can you help me in booking flight ticket?

ASSISTANT: Yes, I can help you with that. Could you help me with travelling airport codes?

USER: In Boston there is a airport it is near to my location that is MA-BOS and  destination airport code is NC-CLT.

ASSISTANT: Ok, can I know your travelling dates?

USER: I would like to leave Boston on 12/17 and return date is 12/19.

ASSISTANT: Give me a second, I will get back to you. Sorry to say that there is no flight found matching your requirement. Sorry for the inconvenience.

USER: Ok, no problem.

ASSISTANT: Can I know your name for documentation purpose?

USER: Sure, my name is Laura Thomas. Thank you for your information.

ASSISTANT: You are most welcome.