You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Sandra White here.

ASSISTANT: How can I help you?

USER: I just want to change my existing reservation, due to sudden demise of my grand mother.

ASSISTANT: Ok, wait a while I will check the status.

USER: Ok.

ASSISTANT: Sorry, to inform you there is no reservation found under your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.