Hello.
Hello. How can I assist you today?
I want to change my existing  reservation, because I want to travel  with my friends by road. Can you help me in changing the ticket?
Sure, I am glad to help you in modifying your reservation.
Thank you.
Can you please provide your name as I need to check your previous reservation status?
Yes, I am Ashley Young.
Ok, thank you. Sorry Young for the inconvenience caused, there is no reservation found under your name in our records to amend it.
Ok, not a problem.
Thank you for choosing our agency.