You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what sort of help are you seeking from us?

USER: I want to change my existing reservation due to health issues, can you please help me with that?

ASSISTANT: Sure, I can change your reservation right now. Before that I need to know your good name please?

USER: My name is Donald Edwards.

ASSISTANT: Thanks for providing your name, Please stay online, I will check the previous list and revert to you.

USER: Sure.

ASSISTANT: Thanks for remaining so positive, We are sorry to say that there is no active reservation found on your name.

USER: No problem, thank you.

ASSISTANT: Thanks for choosing us, wish you a great day.