Hello, I am Helen Hall.
user
Hello, how may I assist you?
assistant
I did a mistake while reserving a ticket last week. Could you please modify my existing reservation?
user
Sure, please wait a moment, I will check and get back to you.
assistant
Ok.
user
There is no reservation on your name.
assistant
No problem, thank you for checking with my existing reservation.
user
Thanks for choosing us.
assistant