You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

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

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

USER: I am Pamela Hernandez.

ASSISTANT: Thank you. Please wait for a moment.

USER: Ok.

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

USER: No issues. Thank you.

ASSISTANT: Welcome, thank you for reaching us.