You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi.

USER: I am Rebecca Roberts.

ASSISTANT: How may I assist you?

USER: Can you help me to book a flight ticket from PHX to MCO?

ASSISTANT: Sure, Is there any class preference?

USER: No.

ASSISTANT: May I know when you are planning to travel?

USER: I am travelling from Sept 1 to Sept 3.

ASSISTANT: Do you need any halt in between your journey?

USER: No, I need a direct flight.

ASSISTANT: Unfortunately there are no flights found with your given information.

USER: That's ok, no problem.

ASSISTANT: Thank you.

USER: Thank you.