You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My grandfather is in Hospital, so I want to cancel my reservation.

ASSISTANT: May I know your name for cancelling reservation?

USER: Jack Clark here.

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: No reservation found on your name Jack Clark.

USER: Thank you for helping me.

ASSISTANT: Thank you for contacting us.