You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

USER: Alexander Nelson here, due to an emergency I want to cancel my reservation. Can you please help me with it?

ASSISTANT: Sure, wait a minute.

USER: Sure.

ASSISTANT: Thank you for your assistance. Your ticket has been cancelled. Amount will be credited in your bank account within four working days.

USER: Thank you.

ASSISTANT: Thank you for choosing us, have a nice day.