You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help 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 Las Vegas 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, I will help you, can I know your good name to check your recent reservation?

USER: Thank you for considering my request. My name is Katherine Roberts and I have done reservation with the same name.

ASSISTANT: Give a moment.

USER: Sure.

ASSISTANT: Sorry to inform this, I had checked in recent reservation list on your name but no reservation is found.

USER: No worries, it might not booked properly at the time of booking. Anyways thank you for the information.

ASSISTANT: Thank you for contacting us.