You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Stephen Walker.

ASSISTANT: How can I aid you?

USER: I am sport's player, I have a plan to attend a sport's meeting in Charlotte. Can you help me for booking a flight ticket?

ASSISTANT: May I know your nearest airport codes please?

USER: My travelling airport codes are from SFO to CLT.

ASSISTANT: May I know your preferable journey dates please?

USER: My travelling dates are 02/10 and 02/12.

ASSISTANT: Stephen Walker, no flights are available in your route.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for approaching us.