You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Stephen Allen  and  I need to attend a business meeting in TX-HOU on 04/14 from NC-CLT on 04/12.

ASSISTANT: OK. We are here to help you. Let me check what flights are available for you.

USER: OK.

ASSISTANT: Thanks for your time. Unfortunately we did not find any flights available matching your criteria.

USER: OK , thank you  for the information.