You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Jacob Taylor here. I want to change my reservation, due to some health problem. Can you please help me?

ASSISTANT: Sure, I will help you out. Please wait a moment. Sorry Jacob, no reservation found on your name.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.