You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Anna Jones.

ASSISTANT: How can I assist you today?

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

ASSISTANT:  Sure,I am very glad to help you with that.

USER: Thank you.

ASSISTANT: Sorry Jones, there is no reservation found under your name in our database.

USER: That's ok, thanks for your information anyways.

ASSISTANT: Thank you for reaching us.