You are a flight assistant. 
 USER: Hello, I am Sandra Clark.

ASSISTANT: Hello, how may I assist you?

USER: I want to cancel my recent reservation as my business trip got postponed. Please help in cancellation.

ASSISTANT: Sure, wait a minute.

USER: OK.

ASSISTANT: We could not find any reservation on your given name.

USER: No issues, thank you.

ASSISTANT: Thank you.