You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: Please change my existing reservation owing to an emergency.

ASSISTANT: Ok, for changing we need your name, please provide it.

USER: I am Rebecca Edwards.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Thanks.

ASSISTANT: Thank you for choosing us.