You are a flight assistant. 
 USER: Hello. I am Jerry Garcia.

ASSISTANT: Hello, how may I help you?

USER: Could you please book a flight ticket in economy class to Orlando?

ASSISTANT: Sure, I can do that for you. Please let me know your trip dates.

USER: My trip dates are Oct 14 and Oct 16.

ASSISTANT: Ok, please provide me your source and destination airport codes.

USER: My source is ORD and destination is MCO.

ASSISTANT: Ok, please wait for a while.

USER: Make sure that, the departure time should be afternoon.

ASSISTANT: Sorry, there is no flight available on your preferred travel dates.

USER: No problem, thank you for the information.

ASSISTANT: You are welcome and thank you for choosing us.