You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jonathan Scott.

ASSISTANT: How can I assist you at this moment?

USER: Due to my health problem I want to change my reservation, can you please help me that?

ASSISTANT: Sure, I will aid you. Please wait for a while.

USER: Ok, I will wait for your information.

ASSISTANT: Sorry Jonathan Scott, no reservation found on your name in our data list.

USER: Ok, no problem.

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

USER: Thank you.