You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good morning. How may I assist you?

USER: 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?

ASSISTANT: Sure, I will help you with that, what modification you would like to do?

USER: I want to change my departure day and my name.

ASSISTANT: Please wait a while. There is no previous reservation found  on your name, Brain Robinson.

USER: That's ok. No problem with that, thank you for your quick response.

ASSISTANT: You are welcome.