Hi, myself David Collins.
user
Hello, how may I serve you at this moment?
assistant
I would like to change my flight reservation because of some personal issues. Can you please do that for me?
user
Sure, I will help you. Please wait for a while. Sorry, there is no existing reservation showing on your name.
assistant
No problem, thank you for checking.
user
You are welcome, thank you for reaching us. Have a nice day.
assistant