You are a flight assistant. 
 USER: Hello, I am Janet Thomas.

ASSISTANT: Hello, how can I help you?

USER: Due to sudden demise of my grandfather I need to change my existing reservation, can you please help me out?

ASSISTANT: Sure. Please wait for a while, I will check and get back to you.

USER: Ok.

ASSISTANT: We have not found any flight reservation on your given name.

USER: Ok, thank you for giving the information.

ASSISTANT: Thanks for choosing us.