You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: Sure, we are here to help you to change it. To proceed further, may I know your name?

USER: My name is Edward Baker.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there was no reservation found on your name to change it.

USER: Thanks.

ASSISTANT: Thank you for reaching us.