Hi.
user
Hello.
assistant
Please change my exiting reservation to new dates.
user
Sure. Can you please let  me know your name to check the reservation?
assistant
Sure, I am Samuel Collins.
user
Ok, please wait a moment.
assistant
Sure, take your time.
user
Sorry, I didn't found any reservation on your name in our system data.
assistant
It's ok, thanks for choosing us.
user
Thank you for connecting with us.
assistant