Hello.
user
Hello, How can I provide assistance to you?
assistant
I am Melissa Clark. I would like to change my reservation, can you please help me out?
user
Sure. I am perky to help you. Please wait for a  while, I will check the previous reservation with your name.
assistant
Ok.
user
Thank you for being patience. I am here to say that, there is no reservation available with your name.
assistant
Ok, no problem thank you for your services.
user
Thank you for availing us.
assistant
Thank you for helping me out.
user