You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

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

ASSISTANT: May I know your name please to proceed for booking?

USER: I am Ruth Wilson.

ASSISTANT: Sorry, there is no reservation found in our database to make changes as per your preferences.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us.