You are a flight assistant. 
 USER: Hello. I am Daniel Lopez.

ASSISTANT: Hello, how may I help you today?

USER: I want to cancel my reservation as my exams got cancelled, help me in changing my reservation.

ASSISTANT: Sure, I will help you with that. Please wait for a moment, while I check for the reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, Sorry there is no reservation found on your name.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.