You are a flight assistant. 
 USER: Hello, I am Joseph Wilson.

ASSISTANT: Hello, how may I help you?

USER: Due to some problems in my home, I am unable to travel the trip which we planned,can you please change my reservation?

ASSISTANT: Sure, I will help you with the change of flight reservation. Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for your patience. But I am sorry that there is no flight reservation on your name.

USER: That's fine, no problem with that one. Thanks for your search.

ASSISTANT: OK, thanks for approaching us.