Hi.
user
Hello.
assistant
I am Stephen Green.
user
Welcome to our agency, how may I assist you?
assistant
I want to change an existing reservation due to sudden change in my  trip. Can you help me?
user
Sure, I will help you. Please wait a moment.
assistant
Ok.
user
Green, no reservation has been found on your name in our records.
assistant
No issue. Thank you.
user
Thank you for approaching us.
assistant