Hi,.
user
Hello, how  may I help you?
assistant
Owing an emergence, I want to change my existing reservation. Can you help me with it?
user
Sure, I am here to help you. Can please provide your name?
assistant
My name is Thomas Hernandez.
user
Ok, give me a minute please.
assistant
Sure.
user
Thanks for your time, sorry no reservation found with your name.
assistant
Ok, no issues.
user
Thank you for reaching us, have a nice day.
assistant