You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

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

ASSISTANT: Sure, I am here to help you. may I know your name?

USER: Richard Robinson here.

ASSISTANT: There is no reservation found under your name.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for choosing us.