You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Please look for the flights which are running on the route from HOU to CLT, can you please book a ticket for me if tickets are available?

ASSISTANT: What dates I shall check the availability of flights from HOU to CLT?

USER: I will be starts on 09/27 and 09/29. I need a direct flight.

ASSISTANT: I'm sad to inform you about no availability of direct flight, I can help you if you are ok with single connection. Let me know if you need any other reservations.

USER: It's ok, no issues.

ASSISTANT: Thanks for reaching us, have a great afternoon.

USER: Welcome.