You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I guide you?

USER:  I am Nicole Thompson. I am planning to change my recent reservation, due to health issue.

ASSISTANT: Sure, give me a minute.

USER: Can you please change my reservation?

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

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

ASSISTANT: Thank you for opting us.