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

ASSISTANT: Hello, how may I help you?

USER: Owing to an emergency, I want to cancel my reservation. Could you help me in the cancellation?

ASSISTANT: Sure, wait a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation on your given name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you.