You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how  may I assist you today?

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

ASSISTANT: Sure, I am here to help you. Please stand by.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for choosing us, hope to serve you again.