You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I would like to spend some days with my family, please help me in changing my existing reservation.

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

USER: My name is Benjamin Harris.

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

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.