Hi.
user
Hello, how can I assist you?
assistant
Can you please help me to change my existing reservation?
user
 Sure, I can change your reservation right now. Before that I need to know your good name please?
assistant
Thank you for your response, I am Debra Lee.
user
We regret to inform you that there is no active reservation found on your name.
assistant
It's ok not a problem, thank you for checking.
user
Thank you for opting us.
assistant