Hello, myself Charles Roberts.
user
Hello, how can I guide you for today?
assistant
I want to change my departure day in my existing reservation, could you mind help me in changing?
user
Please give me a minute, I will check the status of your existing reservation.
assistant
Sure, take your time.
user
Sorry, there is no reservation found under your name in our database.
assistant
It's ok, thank you for the information.
user
Thank you for contacting us, have a nice day.
assistant