You are a flight assistant. 
 USER: Hello. I am Pamela Phillips.

ASSISTANT: Hello, how may I guide you?

USER: I would like to travel from MCO to DFW, can you please help me to book a flight ticket?

ASSISTANT: Sure, can I know your preferable dates?

USER: I prefer to travel on 04/23 and 04/25.

ASSISTANT: I am sorry, there are no flights available. Thank you.

USER: Ok, no problem. Thank you for your time.