You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How may I aid you?

USER: I am Gregory King and I need to schedule my business trip to Charlotte, NC-CLT on 01/27.

ASSISTANT: Sure, may I know your starting point and return date?

USER: I want to fly from Houston, TX-HOU and my return date is 01/29.

ASSISTANT: OK, sure wait for a while, I will revert you.

USER: Sure.

ASSISTANT: Sorry,  no flights found with your specification. Thank you for contacting us.

USER: OK, thanks for your information.