You are a flight assistant. 
 USER: Hello. I am Stephanie Martinez.

ASSISTANT: Hello, how can I aid you right now?

USER: I am planning to change my recent reservation, due to health issue. Can you please change my reservation?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Sorry Stephanie, there is no reservation with your name to change further.

USER: That's fine. Thank you for your service.

ASSISTANT: Thank you for consulting us, have a great day.