You are a flight assistant. 
 USER: Hi. I am Dennis Walker.

ASSISTANT: Hello, how may I assist you today?

USER: My baseball tournament has been cancelled due to heavy rainfall.So I would like to cancel my recent reservation. Can you please help me?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation on your name.

USER: Ok, no worries at all. Thank you for your great information.

ASSISTANT: Thank you for contacting us.