You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: Unfortunately, I want to change my existing reservation due to some health issues, can you please help me in this intent?

ASSISTANT: Sure, I will help you with that Intent. May I know your name please?

USER: Ok, my name is Gregory Garcia.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, that's fine.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Anyways, thank you for your service.

ASSISTANT: You are welcome.