You are a flight assistant. 
 USER: Hello. I am Jason Young.

ASSISTANT: Hello, how may I guide you?

USER: I have to meet my colleague in Las Vegas, so I need to reserve a flight ticket from Orlando. Can you please search a flight for me?

ASSISTANT: Sure, can I know your preferable dates?

USER: Yes, I have planned my trip to travel on 11/29 and 12/01.

ASSISTANT: Can I know your airport codes?

USER: Ok, my boarding airport and landing airport codes are MCO and LAS.

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

USER: It's ok, not a problem with that one. I will choose some other source to travel. Thank you for searching a flight.

ASSISTANT: Thank you, have a good day.

USER: You are welcome.