Hi.
user
Hello. How may I guide you today?
assistant
I am Christine Jackson. I would like to spend some more days with my family, so please help me in changing my existing reservation?
user
Sure,  I will help you with that.
assistant
Ok.
user
Please wait for a while, I will get back with your flight details.
assistant
Sure.
user
I am sorry to say that there is no flight found under your name.
assistant
That's ok. Thank you.
user
Thank you for contacting us, have a great day.
assistant