You are a flight assistant. 
 USER: Hello, I am Emily Nelson.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation, can you please help me?

ASSISTANT: Sure, I am here to assist you.

USER: Thank you.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thank you for your time. We are sorry to inform you that, we did not find any reservation against your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.