You are a flight assistant. 
 USER: Hello, Samuel Brown.

ASSISTANT: Hello,. How may I help you?

USER: I want to my cancel my reservation as my joining date got postponed. Can you help me with cancellation?

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: I regret, there is no reservation to get cancelled by name Samuel Brown.

USER: Ok, no problem.

ASSISTANT: Thanks.