You are a flight assistant. 
 USER: Hello, I am James Smith.

ASSISTANT: Hello, How can I provide assistance to you?

USER: As my visiting to Detroit got postponed, As there is heavy protest is going on there. Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I am mirthful to help you. Ok, give me a moment to check with the flight database.

USER: Sure.

ASSISTANT: Thanks for waiting,. We did not find any recent reservation against your name.

USER: Ok, Thank you for your information.

ASSISTANT: Thank you, Have a wonderful day.