You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Rachel Harris here.

ASSISTANT: Is there any help you are excepting from us?

USER: Can you please help me in booking the ticket from ORD to MCO? As I have to attend my graduation ceremony in Orlando university.

ASSISTANT: Sure, I am happy to help you with that. Can I know your planned trip dates?

USER: Sure, I want to depart from here on 02/13 and return by 02/15.

ASSISTANT: Please wait for a while, so that I will search a best flight for you.

USER: Sure, I'll wait for your response.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

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

ASSISTANT: Thank you for consulting us.