You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to change my recent reservation. Can you help me out?

ASSISTANT: Sure, I am here to help you with this. May I know your name please?

USER: Mary Campbell.

ASSISTANT: Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry Mary, there is no active reservation found as per your name to change it.

USER: That's ok. Anyways, thank you.

ASSISTANT: You are welcome.