You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Andrew Hill.

ASSISTANT: Andrew Hill, how may I aid you?

USER: I want to cancel my recent reservation, due to sudden demise of my grand father. Can you please help me?

ASSISTANT: Sure, please wait for a while.

USER: Sure, take your own time.

ASSISTANT: Sorry, no reservation is available by your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.