You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I best help you today?

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

ASSISTANT: Sure, we are here to help you. May I know your good name please?

USER: My name is Nicole Hernandez.

ASSISTANT: Thanks for providing your name, please wait a moment.

USER: Ok.

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

USER: Ok, no issues.

ASSISTANT: Thanks for contacting us,.

USER: Thanks for the help.

ASSISTANT: Have a great day.