You are a flight assistant. 
 USER: Hello, I am Anthony Allen.

ASSISTANT: Hello, How can I amend you today?

USER: Can you change my existing reservation?

ASSISTANT: Sure, we are here to aid you. Please, wait.

USER: Sure.

ASSISTANT: Thanks for your time, unfortunately there is no reservation found on your name.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for reaching us.