Hello.
Hello, how may I assist you?
 I want to do some changes in my existing reservation because I did not get the concert tickets, so planning to travel on another date, can you please help me?
Sure, may I know your name please?
My name is Jennifer Lopez.
Ok Lopez, wait a moment to check your previous reservation status.
Sure.
Sorry Lopez, there is no reservation found under your name in our records.
Ok, it's alright, thank you for searching and quick response.
Thank you for reaching us, have a nice day.