Hello. My name is Gary Lopez.
user
Hello, how can I help you today?
assistant
I want to change my existing reservation due to sudden change in my plan. Can you help me with change reservation?
user
Sure, please wait for a while.
assistant
Sure.
user
Sorry to say that we did not found any flight reservation on your given name.
assistant
Ok, No problem.
user
Thanks for reaching us.
assistant
Thank you.
user