You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what help you need from us?

USER: Actually my father's retirement ceremony is postponed, so that I want to cancel my recent reservation. Can you help me with that?

ASSISTANT: Sure, I will assist you with that.

USER: Ok.

ASSISTANT: I need to know your name for checking your past reservation, can you please provide it?

USER: Sure, the previous reservation is done under the name of Donna Lewis.

ASSISTANT: Ok, can you please wait a moment, while I am checking the ticket status?

USER: Ok, sure.

ASSISTANT: Sorry to inform you, I didn't found any reservation with your name, I think it might be not confirmed before.

USER: Oh! that's fine, I will check any other way. Anyway's thank you for your valuable time.

ASSISTANT: You are most welcome. Have a nice day Donna Lewis.

USER: Thank you.

ASSISTANT: Thank you for consulting our services. Keep contacting us.

USER: Sure.