Amy Brown here.
user
Hello, welcome to flight booking agency. How can I assist you today?
assistant
 I would like to spend some more days with my family, so please help me in changing my existing reservation.
user
Please allow me a moment to check for the previous reservation in our data base.
assistant
Ok.
user
Amy, there is no reservation found under your name.
assistant
That's ok. Thank you for your response.
user
You are welcome. Thank you for contacting us.
assistant