You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Dorothy Mitchell.

ASSISTANT: How may I assist you?

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

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Dorothy, no reservation has been found on your name in our records.

USER: That's ok, thank you.

ASSISTANT: Thank you for approaching us.