You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: Due to emergency health issue I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, may I know your good name please?

USER: Andrew Gonzalez.

ASSISTANT: Ok, please wait a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Ok, it's not an issue. Thanks for your information.

ASSISTANT: Thanks for connecting us, have a good day.