Hello.
Hello, good morning. How may I assist you?
I am Brain Robinson. Recently with the help of your agency, I reserved a flight ticket. But I need some modifications in my existing reservation. Will you help me in such process?
Sure, I will help you with that, what modification you would like to do?
I want to change my departure day and my name.
Please wait a while. There is no previous reservation found  on your name, Brain Robinson.
That's ok. No problem with that, thank you for your quick response.
You are welcome.