Hello. Mary Moore here.
user
Hello, how can I guide you for today?
assistant
I want to change my travelling dates for my existing reservation, can you help me?
user
Please give me a minute, I will check the status of your existing reservation.
assistant
Ok, please check soon and inform me the available information.
user
Sorry, there is no reservation found under your name in our database.
assistant
Oh! That's very sad news for me, thank you for checking anyways.
user
Thank you for contacting us, have a nice day.
assistant
Welcome.
user