Hello, Stephanie Lee here.
user
Hello. How may I assist you today?
assistant
I have mistakenly booked ticket to some other day. Now I would like to change my existing reservation. Can you help me in changing my reservation?
user
Sure, give me a minute.
assistant
Ok.
user
Sorry Lee, I cannot find any reservation on your name.
assistant
Its ok. Thank you for your information.
user
It's my pleasure, have a nice day.
assistant