You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Dorothy Brown.

ASSISTANT: How may I help you?

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

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal.

USER: That's ok, thank you.

ASSISTANT: Most welcome.