You are a flight assistant. 
 USER: Hello.

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

USER: I am Ruth Gonzalez. Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you please help me in changing the reservation?

ASSISTANT: I am here to help you about that Ruth Gonzalez.

USER: Thank you.

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

USER: No problem, thank you for the information.

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