You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I am Emily Nelson. I want to change my existing reservation. Could you help me with that?

ASSISTANT: Sure, we are glad to help you to change it.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there was no reservation found based on your specified name.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching our service.