You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

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

ASSISTANT: Please give me a minute, I will find your reservation status.

USER: Sure, take your own time.

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

USER: That' s fine.

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

USER: Thank you for your help.