Hi, I am Stephen Roberts.
user
Hello, how can I help you today?
assistant
As I want to spend some more time with my friend, so I want to change my existing reservation. Can you please help me out?
user
Sure, please wait I will get back to you.
assistant
Ok.
user
Thanks for waiting, no flight reservation found on your name.
assistant
That's fine, thank you for the response.
user
Thank you for choosing us.
assistant