Hello.
user
Hello. How can I assist you today?
assistant
 I am Barbara Smith. Actually, I didn't found the option of change reservation. Can you do this for me?
user
Sure, please allow me a moment to check for the previous reservation.
assistant
Sure.
user
Barbara, there is no reservation found under your name.
assistant
That's fine. Thank you for your time.
user
Thank you for contacting us.
assistant