You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Myself Donald Miller, as I have done a reservation accidentally last week but I have lot of ways to cancel my reservation but for a last try with your service. Can you please help in cancellation of my reservation?

ASSISTANT: Sure, I am here to help you. Please wait for a moment to check your reservation status.

USER: Thanks for give me a positive hope about that. Sure, I will wait for your response.

ASSISTANT: Sorry to say, no reservation found on your name in my database.

USER: Oh! it might be cancelled with one of the method which I have tried to cancel my reservation but I have not received any confirmation. Anyways thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.