You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Sandra Jones. I just want to change my existing reservation, due to sudden demise of my grand mother. Can you please help me?

ASSISTANT: Ok, please wait.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for reaching us.