Hi,.
 Hello, how can I assist you today?
 I made a reservation earlier, but unfortunately I have misplaced the dates unknowingly. So, I want to make some few changes.
Ok.
Can you help me with changing?
Sure, I will help you with that.
Thank you.
Please wait a while. Sorry, Let me know your name to check your reservation?
Sure, Daniel Johnson is my name.
Ok, Thanks for the name. I have checked in reservation list to change your ticket, but could not find any reservation with your name.
That's ok, not a problem. Thanks for your kind information.
Thank you for reaching us.