You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me out in changing my recent reserved ticket?

ASSISTANT: Sure, we are here to help you. May I know your name please?

USER: Katherine Nelson here.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: That's ok, thank you.

ASSISTANT: Thanks for reaching us, have a nice day.