You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Due to my ill health, I would like to change my existing reservation.Could you please help me out?

ASSISTANT: Sure, may I know your good name please?

USER: My name is Jacob Wright.

ASSISTANT: Sorry, there is no previous reservation found on your name to change.

USER: Ok, thank you for your help.

ASSISTANT: Thank you for approaching us.