You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Owing to an emergency, I just want to change my existing reservation. Can you please help me to change it?

ASSISTANT: Sure, we are happy to help you.

USER: Thank you.

ASSISTANT: Please share me your good name.

USER: Sure, my name is Dorothy Jackson.

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

USER: Ok, thanks for your help.

ASSISTANT: Thank you for opting us.