You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I will help you with changing, please hold on for a moment to check your reservation status. May I know your name please?

USER: Ok, I have reserved my flight ticket with name Shirley Wright.

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

USER: Ok, fine thank you for checking.

ASSISTANT: It's my pleasure, have a nice day.