You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you today?

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

ASSISTANT: Sure, may I know your name to check further?

USER: My name is Gary Jones.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name.

USER: Thank you.

ASSISTANT: Thank you for contacting us.