You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I be at your service today?

USER: I am Linda Nelson. I want to change my existing reservation due to some issues, can you please help me with that?

ASSISTANT: Sure, we are here to help you. Please give me sometime to check your details, I will back to you with the current status.

USER: Sure.

ASSISTANT: Sorry to inform you that we didn't find any active reservation on the name Linda Nelson.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.