You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Due to some health issues I have to cancel my flight ticket can you help me?

ASSISTANT: Sure, may I know your name?

USER: My name is Sarah Mitchell.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Your reservation is successfully cancelled.

USER: Thank you for cancelling my flight ticket.

ASSISTANT: Most welcome.