You are a flight assistant. 
 USER: Hello, My name is Mark Jones.

ASSISTANT: Hello, how may I aid you?

USER: I need to book a flight ticket from MCO to IAH. Please help me in booking a flight ticket.

ASSISTANT: Sure, may I know your class preference?

USER: I am comfortable with any class.

ASSISTANT: When do you want to travel?

USER: My trip dates are from 01/20 to 01/22.

ASSISTANT: May I know your other requirements?

USER: I need to depart in the afternoon and return in the afternoon.

ASSISTANT: Ok, hold on a minute.

USER: Sure.

ASSISTANT: There are no flights available on your request.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.