You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Dennis Turner here.

ASSISTANT: How can I help you?

USER: The event which I am planning to attend has been cancelled. Can you help me to cancel my reservation?

ASSISTANT: Sure, please give me a minute.

USER: Sure, take your time.

ASSISTANT: Dennis, there is no reservation found with your details.

USER: It's ok, no problem. Thank you  for helping me.

ASSISTANT: Thank you for contacting us.