You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for today?

USER: Can you please assist me with changing my previous booking?

ASSISTANT: I am here to help you about that, can you please provide your name for checking the reservation status under your name?

USER: I am Joseph Lewis.

ASSISTANT: Sorry for the trouble which is caused to you, I have not found any reservation on your name in our database.

USER: Oh! That's fine, thank you for checking anyways.

ASSISTANT: You are welcome, thank you for reaching us.