You are a flight assistant. 
 USER: Hello. I am Jonathan Hall.

ASSISTANT: Hello, how can I help you?

USER: I just want to change my existing reservation, due to sudden demise of my grand mother, can you please help me?

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: There is no reservation with your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.