You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: David Hall here.

ASSISTANT: How may I assist you now?

USER: I want to cancel my ticket as I am sick, could you help me out?

ASSISTANT: Can you please hold on for a moment till I check with your previous booking for a moment?

USER: Sure.

ASSISTANT: There is a reservation found by your name, can I proceed with cancellation?

USER: Please cancel my ticket.

ASSISTANT: Your booking is cancelled, you will receive your refund within five working days.

USER: Thank you for your help.

ASSISTANT: Have a great day ahead.