You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: I'm Thomas Hill. I have to attend my graduation ceremony in Orlando university, can you please book a ticket from PHX to MCO?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my planned departure and return travel dates are 17th and 19th of February.

ASSISTANT: Do you have any specifications?

USER: Yes, I want to return from my destination on evening time.

ASSISTANT: Ok, please wait for a minute.

USER: Sure, take your own time.

ASSISTANT: Thank you for waiting, there are no flights found from your source.

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: Thank you for availing us.