You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I abet you?

USER: My football Tournament has been cancelled due to heavy rainfall, I want to change my reservation. Can you help me?

ASSISTANT: Sure, may I know your name please?

USER: I am Karen Allen.

ASSISTANT: Please standby, I will check and revert to you.

USER: Sure.

ASSISTANT: Sorry, we do not found any active reservation with your provided name.

USER: That's ok, not a problem. Thank you for your service.

ASSISTANT: Thanks for approaching us, hope to serve you again.