You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Will you cancel my ticket? Because my grand father was hospitalised suddenly.

ASSISTANT: Sure, may I know your name?

USER: I am Andrew Miller.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Thank you.

ASSISTANT: Thank you for choosing us.