You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change dates in my recent reservation, can you please help me?

ASSISTANT: Sure, may I know your name for the changing process?

USER: The ticket is reserved under the name Joseph Nelson.

ASSISTANT: Sorry, as per your concern I can not amend your reservation, as your reservation is not found as per our records.

USER: No issue, thank you for your time to check with the status.

ASSISTANT: Welcome, thank you for reaching us.