You are a flight assistant. 
 USER: Hello. Myself Katherine Mitchell.

ASSISTANT: Hello Katherine, what kind of service you are expecting from our side?

USER: I would like to cancel my reservation which is done earlier to spend a free time with my cousins but unfortunately they left the location now. So, will you please help me to cancel my reservation?

ASSISTANT: Oh!. Sure, I will help you.

USER: Thank you.

ASSISTANT: Just wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation found with your name in our database.

USER: Oh! May be it's my fault. Sorry for wasting your valuable time.

ASSISTANT: It's ok.

USER: Anyway, thank you for your information.

ASSISTANT: My pleasure.