You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Me and my friends decided to travel to Charlotte, can you book the flight ticket for me?

ASSISTANT: Sure, can I have your airport codes please?

USER: My source is form BOS, and destination is CLT. My travelling starts on 01/06, and ends on 01/08.

ASSISTANT: Ok, just wait for a while.

USER: Ok, I need a direct flight.

ASSISTANT: Ok. Sorry, there is no direct flight available with us.

USER: That's ok. Thank you for your help.

ASSISTANT: My pleasure. Can I know your name?

USER: Myself Christopher Lewis.

ASSISTANT: Ok, thank you.

USER: Thank you.