You are a flight assistant. 
 USER: Hi. I am Patrick Parker.

ASSISTANT: Hello, how can I support you?

USER: I would like to cancel my reservation, as my volleyball competition is postponed. Can you help me in cancelling?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Ok.

ASSISTANT: Thank you for being patient. I regret, no reservation exist for Patrick Parker.

USER: That's ok, thank you for checking.

ASSISTANT: Ok, Thank you for approaching us.