Hello.
user
Hello. How can I serve you?
assistant
My business trip has been postponed, can you please help me for changing  the existing reservation?
user
Ok, please tell me your name.
assistant
Sure, my name is Larry Walker.
user
Larry Walker, no reservation was found by your name. Thank you for reaching us.
assistant
No problem, thank you for your information.
user
Have a great day ahead.
assistant