Hi.
user
Hello, how may I assist you today?
assistant
Can you please help me in changing my existing reservation?
user
Sure, please share me your good name.
assistant
Dorothy Turner.
user
Please wait for a while.
assistant
Sure.
user
Sorry to say that, there is no active reservation found on your  name.
assistant
Ok, no issues.Thank you.
user
Thank you for opting us.
assistant