You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Owing to an emergency I want to cancel my reservation, can you help me?

ASSISTANT: Sure, please wait for a moment to check your details. Meanwhile, may I know your name?

USER: Myself Charles Carter.

ASSISTANT: Sorry, no reservation found on your name. Thank you for choosing us, have a nice day.

USER: Thank you.