You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I am here to help you with that, can I know your good name to proceed further?

USER: I am Anthony Williams.

ASSISTANT: Thank you very much. Please wait for a while, let me check your reservation status in our database.

USER: Ok.

ASSISTANT:  I am very sorry to inform you that there is no reservation found under your name in our database.

USER: No issues, thank you.

ASSISTANT: Thank you very much for approaching our agency.