You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I best serve you today?

USER: I need your assistance about modification of my reservation which I have done long back to travel in the next month to Chicago but all of sudden my schedule got postponed to some other as on of my relative got expired last night. Can you please help me about that?

ASSISTANT: Sure, please share me your good name.

USER: Sure, my name is Frank Hall.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you for availing us.