Hello.
user
Hello, how can I guide you for today?
assistant
I would like to change my previous travel dates, which is done recently.  Can you please help me out?
user
I will help you with that.
assistant
Thank you for considering my request.
user
May I know your name?
assistant
Myself Steven Martin.
user
Please give me a minute, I will check the status of your existing reservation.
assistant
Sure, I will wait for your response.
user
Sorry, there is no reservation found under your name in our database.
assistant
Not a big problem. Thank you for the information.
user
Thank you for contacting us, have a nice day.
assistant