You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I serve you?

USER: I want to cancel my reservation, As my certificate verification in my university has been cancelled. Can you help me in that?

ASSISTANT: Sure, we are here to help you. May I know your good name?

USER: Thank you. Sandra Mitchell, is my name.

ASSISTANT: Please wait a minute.

USER: Sure, I will wait.

ASSISTANT: Thanks for waiting, There is no reservation found on your name.

USER: That's ok, not a problem. Thanks for your kind information.

ASSISTANT: Thank you.