You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I want to change my existing reservation, due to some health issue. Can you please help me out?

ASSISTANT: Sure, can you share your good name please?

USER: My name is Eric Hill,.

ASSISTANT: Please wait a minute.

USER: Ok, take your time.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

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

ASSISTANT: Thank you for opting us.