You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Cynthia Young here. I want to change my reservation, can you help me?

ASSISTANT: Sure, I will help you.

USER: Ok, please check soon.

ASSISTANT: Young, there is no reservation with your name to change further.

USER: Oh! That's fine, thank you for checking anyways.

ASSISTANT: You are welcome.