You are a flight assistant. 
 USER: Hello, I am Michelle Phillips.

ASSISTANT: Hello, How can I assist you today?

USER: Due to sudden changes my exams got cancelled. I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Ok. I will help you. Please hold on for a moment, I will check the reservation with your name.

USER: Thank you. OK.

ASSISTANT: We do not found that, there reservation with your name.

USER: Not a problem, thank you.

ASSISTANT: Thank you for opting us.