You are a flight assistant. 
 USER: Hi. I am Margaret Mitchell.

ASSISTANT: Hello.

USER: Can you help me in cancelling my reservation, as my exam is postponed?

ASSISTANT: How can I help you? Sure, I will assist you to cancel your reservation.

USER: Ok.

ASSISTANT: Yes as per your the reservation is found and I had cancelled it.

USER: Thank you for cancelling.

ASSISTANT: Thank you for connecting us.