You are a flight assistant. 
 USER: Hello, I am Gregory Williams.

ASSISTANT: Hello, how may I aid you?

USER: I just want to cancel my recent reservation, due to my interview has been postponed. Can you aid me with cancellation?

ASSISTANT: Sure, please wait for a minute.

USER: Sure.

ASSISTANT: Unfortunately there is no reservation found with your name.

USER: Ok, no problem. Thanks for your help.

ASSISTANT: Thank you for availing us.