Hi.
user
Hello.
assistant
Myself Stephen Scott.
user
How can I assist you Stephen?
assistant
I want to change my reservation, can you please do that for me?
user
Sure, I will help you with that. Please give me  a moment.
assistant
Sure, I will wait for your response.
user
No reservation is available on your name in our database.
assistant
No problem, anyway thank you for checking.
user
You are welcome.
assistant