You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I amend you?

USER: Please cancel my recent reservation, owing to an emergency. I am Joshua Williams.

ASSISTANT: Ok. Give me a minute, I will be back and revert you.

USER: Sure.

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

USER: Thanks.

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