You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Can you help me in cancelling my recent reservation, as my exams are postponed?

ASSISTANT: Sure, may I know your name?

USER: Check under the name Melissa Martinez.

ASSISTANT: Thank you. Please wait for a while, I will check your reservation status and let you know.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found by your name in our database.

USER: That's ok, thank you.

ASSISTANT: You are welcome and have a nice day.