Hello.
user
Hello. How may I aid you today?
assistant
Please help me with changing my reservation due to some changes in the plan of my trip with my colleagues.
user
Sure, I will help you with that.
assistant
Thank you.
user
May I know your name please to proceed further?
assistant
My name is Sarah Taylor.
user
I am sorry to inform that  there is no reservation found under your name.
assistant
It's ok, thank you for your help.
user
Thank you for contacting us.
assistant