Hello.
user
Hello, how may I help you today?
assistant
I made a reservation to go for a trip with my friends, but  due to my busy schedule I want to change my reservation. Can you please help me with the same?
user
Sure, we are here to help you.
assistant
Thank you.
user
May I know your name to check the reservation list?
assistant
Sure, my name is David Mitchell.
user
Please wait a moment, I will check your details and get back to you.
assistant
Sure, take your time.
user
David Mitchell, we are sorry to inform you that there is no reservation exist on your name to do modifications.
assistant
Not an issue, thank you for checking it.
user
Thank you for contacting us. Have a nice day.
assistant