You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I help you?

USER: Owing to an emergency, I want to change my existing reservation.

ASSISTANT: Sure, May I know your name?

USER: Sure, David Wilson here.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

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

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you.