You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am William Turner.

ASSISTANT: How may I assist you today?

USER: Please book a flight ticket to Philadelphia on Nov 14 and return back on Nov 16.

ASSISTANT: Sure, could you please share me your airport codes?

USER: My journey airport codes are MCO and PHL.

ASSISTANT: Do you need any lay by in between your journey?

USER: Yes, I need a lay by.

ASSISTANT: Do you need any other specifications?

USER: No.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flight services available on your given route.

USER: No problem, thank you for the information.

ASSISTANT: Thanks for reaching us, have a nice day.