Hello.
user
Hello, how can I help you today?
assistant
I am Lisa Collins. Please, assist me in changing my existing  reservation as my plan to meet my friend got postponed.
user
Sure, we are here to help you.
assistant
Thank you.
user
Wait for a while.
assistant
Sure.
user
Thanks for waiting there is no reservation found on your name.
assistant
It's ok, not an issue. Thank you for the information.
user
Thanks for approaching us.
assistant