Hi.
user
Hello. How may I guide you today?
assistant
Due to sudden change in my trip to another location, I would like to do some changes in existing my reservation. Can you please help me out?
user
Sure,  I will help you with that. May I know your name please?
assistant
Thank you, my name is Amanda Mitchell.
user
I am sorry to say that there is no reservation found under your name.
assistant
That's ok, thank you for checking.
user
Thank you for reaching us.
assistant