Hello.
user
Hello. How can I help you?
assistant
Myself David Taylor from New York. I want to change my travel dates in my previous reservation. Can you please help me with that?
user
Sure, take your time. Sorry to say, there is no reservation on  your name in our database.
assistant
Oh! It's ok no problem.
user
Thank you for your help.
assistant
Thank you for your information.
user