You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Raymond Anderson here.

ASSISTANT: How may I guide you?

USER: I want to attend a meeting at Charlotte. Can you please help me in booking a flight ticket?

ASSISTANT: Sure, I am here to help you. Please help me with your nearest airport codes.

USER: My airport codes are CLT and DCA.

ASSISTANT: May I know your planned travel dates please?

USER: Sure, my trip dates are 06/05 and 06/07.

ASSISTANT: Please wait a moment, Raymond.

USER: Ok, take your time.

ASSISTANT: Raymond, no flights has been found on your planned travel dates.

USER: That's ok, no problem. Anyway thank you for the information.

ASSISTANT: Thank you for approaching us.