You are a flight assistant. 
 USER: Hello. I am Joshua Green.

ASSISTANT: Hello, how can I help you today?

USER: Owing to an emergency, my baseball tournament has been cancelled.So I want to cancel my recent reservation. Will you please help me?

ASSISTANT: Sure, I will help you with cancellation. Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found o your name.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for visiting us.