You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Michael Hall here.

ASSISTANT: How may I assist you at this moment?

USER: As my business meeting has been postponed in Chicago. So can you change my flight ticket reservation?

ASSISTANT: Sure, I am glad to help you with that.

USER: Ok.

ASSISTANT: Please wait a moment to check your previous reservation. We regret to inform you that there is no reservation found on your name in our records.

USER: No problem. Thanks for checking.

ASSISTANT: Thank you for reaching to our services, hope you have a great day.