You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, I am happy to help you. Please let me know your good name.

USER: George Martinez.

ASSISTANT: Sorry, there is no active reservation on your name in our data.

USER: Thanks.

ASSISTANT: Thank you for availing us.