You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you help me?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Dorothy Jackson here.

ASSISTANT: Sorry, there are no reservation found on your name.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for reaching us.