You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: My name is Joseph Jackson. I want to change my existing reservation, can you help me for that?

ASSISTANT: Ok, I will help you with the change. Please wait.

USER: Thank you.

ASSISTANT: Thank you for waiting, there is no reservation been found on your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for connecting with our agency.