Hello.
Hello, how can I assist you now?
Can you please help me to modify my travel dates in the previous reservation?
Sure, I am  happy to help you with that. Can I have your  good name please to check your reservation status?
Thanks a lot for your response. My name is Frank Harris.
Ok,  please wait a moment.
Ok, take your own time and provide me the information about the past ticket.
Sorry Frank Harris, no reservation has found under your name to change.
That's not a problem for me, thanks a lot for spending your time.
Thank you for choosing us, have a good day.