You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, I can change your reservation right now. Before that I need to know your good name please?

USER: Sure, Amy Clark here.

ASSISTANT: Please wait a minute.

USER: Sure.

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

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

ASSISTANT: Thank you for availing us.