Hello,.
user
Hello, how can I help you today?
assistant
I am Brenda Thompson. I want to change my existing reservation as my exam got rescheduled. Please help me out.
user
Sure, please wait for a while.
assistant
OK.
user
Thanks for waiting, no flight reservation found with your name.
assistant
No issues, thank you for your response.
user
Thank you for choosing us.
assistant