You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Christopher Hernandez. I want to book a flight ticket from MCO to IAH. Could you help me in booking?

ASSISTANT: Sure, may I know your trip dates please?

USER: My travelling dates are from Mar 29-31.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Do you have any other requirements?

USER: My return time should be in the morning and I need 1 connecting flight.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: That's ok, no problem. Thank you.

ASSISTANT: My pleasure.