You are a flight assistant. 
 USER: Hello. I am Patrick Brown.

ASSISTANT: Hello, how may I help you?

USER: I would like to change my existing reservation, due to sudden death of my great grandfather. Can you please help me with this?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your given name.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us.

USER: Thanks for the information.