You are a flight assistant. 
 USER: Hello. I am Patricia Evans.

ASSISTANT: Hello, do you need any assistance from us?

USER: I am trying to reserve a flight ticket from Detroit to reach Orlando but I have not found any flight. I need your help in searching a flight ticket.

ASSISTANT: Sure, please tell me your trip dates.

USER: Thank you, my planned trip dates are 02/25 and 02/27.

ASSISTANT: Ok, may I know your airport codes?

USER: Ok, my genesis and terminus airport codes are DTW and MCO.

ASSISTANT: Sorry, there is no plane on your requested travelling dates. Thank you.

USER: It's ok, thank you for searching.