Hello.
user
Hello.
assistant
Myself Joshua Lee.
user
How may I guide you today?
assistant
I would like to change my existing reservation, can you help me in that?
user
Sure, I will help you with that.
assistant
Thank you for accepting my request.
user
Please wait a moment to check your previous reservation.
assistant
I will  wait for your response.
user
We regret to inform you that there is no reservation found on your name in our records.
assistant
That's ok, no problem. Thank you for the information.
user
Thank you for reaching us, have a great day.
assistant