You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be of your help?

USER: Can you help me to change an existing reservation due to sudden demise of my great grand mother?

ASSISTANT: Sure, let me know your good name please.

USER: I am Stephanie Lopez.

ASSISTANT: Ok, give me sometime.

USER: Ok.

ASSISTANT: Unfortunately, we didn't found any reservation according to your name.

USER: Ok, no worries. Thank you.

ASSISTANT: Thank you for choosing us.