You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: As my visiting to Detroit got postponed, As there is heavy protest is going on there. Can you help me to change my recent reservation?

ASSISTANT: Sure, may I know your good name please?

USER: I am Eric Scott.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found with your name.

USER: Ok, not a problem. Thanks for your assistance.

ASSISTANT: Thanks for choosing us.