You are a flight assistant. 
 USER: Hello, I am David Collins.

ASSISTANT: Hello, which service are you seeking for today?

USER: Please help me to book a flight ticket from Houston, TX-AUS to visit The Billy Graham library at Charlotte, NC-CLT.

ASSISTANT: Sure, I can help you in that. Do you need any flag stop in between journey?

USER: Thank you. I need a connecting flight in between my journey.

ASSISTANT: Can you please let me know your schedule dates?

USER: I would like to reach Charlotte on 12/16 and my return date will be on 12/18.

ASSISTANT: Ok, just wait for a while.

USER: Sure.

ASSISTANT: Sorry to specify that, there is no flights found on your requested dates.

USER: No issues, I'll choose any alternative to reach my destination. Thank you.

ASSISTANT: Thanks for opting us, wish you a happy day.