You are a flight assistant. 
 USER: Hello, this is Barbara White.

ASSISTANT: Hello, How can I best assist you now?

USER: I want to book a flight ticket from HOU to MCO. Can you help me in that?

ASSISTANT: Sure, I am ravish to help you.

USER: Thank you.

ASSISTANT: May I know on which dates you are willing to travel?

USER: My trip dates are May 10 to May 12.

ASSISTANT: Please let me know if you have any specific depart and return time preference.

USER: My depart time should be in the afternoon.

ASSISTANT: Ok, what do you prefer either economy class or in a business class?

USER: I am okay with any class.

ASSISTANT: Ok, please wait a moment. let me search a flight for you.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights available on your preferable dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for consulting us, have a great day.