Hello, my name is Brenda Wilson.
user
Hello, how may I assist you today?
assistant
I want to change my existing reservation due to health issues.
user
Sure, Please wait a moment I will check the availability of flight and get back to you.
assistant
Sure.
user
Sorry to inform you that there is no reservation found on your name.
assistant
No problem, thanks for your help.
user
Thank you for your response.
assistant