You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I would like to change my existing reservation, due to sudden demise of my grand father. Can you please help me?

ASSISTANT: Sure, could you please provide your name to check your previous reservation status?

USER: My name is Mary Allen.

ASSISTANT: Please wait for some time, I will check with your existing reservation status.

USER: Sure, take your own time.

ASSISTANT: Thank you for waiting. Sorry to inform you Mary Allen, there is no reservation found with your name in our records to amend it.

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

ASSISTANT: Thank you for reaching us with a query.