You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Kevin Scott here. Can you change my existing reservation to new dates?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Sure.

ASSISTANT: Kevin, there is no reservation found under your name.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for reaching us.