You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Richard Anderson. As my business meeting is postponed, I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: No issue, thank you for checking.

ASSISTANT: Thank you for opting us.