You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you at this moment?

USER: I am Ruth Carter. I want to change my reservation, can you help me?

ASSISTANT: Sure, I will help you with that. Please hold on a moment to check your previous reservation status.

USER: Sure.

ASSISTANT: We regret to inform you that, there is no reservation found on your name in our records.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us, have a great day.