You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I need to change my reservation, can you please help me with that?

ASSISTANT: Sure, I will help you in changing the reservation. Can you please help me with your name?

USER: Katherine Green here.

ASSISTANT: Sorry, there is no active reservation found under your name to amend it.

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

ASSISTANT: Thank you for reaching us.