Hello.
user
Hello. How may I help you?
assistant
My name is Mary Rodriguez. I want to do some changes in my existing reservation. Can you help me for that?
user
Sure,  I will help you. Please, wait a minute.
assistant
Thank you. Sure, I will wait for your response.
user
Thank you for your time, there is no reservation found on your name.
assistant
That's ok, thank you for checking.
user
Thank you for reaching us.
assistant