You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Myself Kimberly Miller. I need to change my existing reservation, can you please help me out?

ASSISTANT: Sure, I will help you. Please hold on a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on given name.

USER: That's ok, thank you for searching my details.

ASSISTANT: Thank you for reaching us.