You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I abet you?

USER: I am Jason Johnson.

ASSISTANT: Ok.

USER: I just want to change my existing reservation, due to sudden demise of my grand mother. Could you please help me in doing that?

ASSISTANT: I am sorry for that. We are here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT:  Thank you for being on hold, We are sorry to inform you that there is no reservation found with your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for availing us.