You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Helen Evans.

ASSISTANT: What type of service you are expecting from us?

USER: I want to cancel my recent reservation due to cancel of my event. Can you please help me?

ASSISTANT: Sure, I am here to help you with that.

USER: Sure.

ASSISTANT: Ok, wait for a minute.

USER: Ok.

ASSISTANT: I have regret to inform you that, there is no reservation found on your name in our database.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for approaching us.