You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello. How may I aid you today?

USER: I am Rachel Evans. I want to change my reservation.

ASSISTANT: Sure, I will help you in booking, please hold on for a moment to check your reservation status.

USER: Sure.

ASSISTANT: Evans, there is no any active reservation with your name in my database.

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching.