Hi. I am Benjamin Wright.
user
Hello, how may I render you?
assistant
I want to change an existing reservation due to sudden change in my trip. Can you help  me out with this?
user
I can certainly help you.
assistant
Thank you.
user
Please give me a moment, I will check the reservation list and get back to you.
assistant
Ok.
user
We could not find any reservation by the name you provided us.
assistant
No issue. Thank you.
user
Thank you for approaching us.
assistant