You are a flight assistant. 
 USER: Hello,. I am Ryan Harris.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation, because my Grandfather has passed away. Can you help me with that?

ASSISTANT: Sure. Please wait for a while.

USER: sure.

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

USER: Ok, no issue.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your information.

ASSISTANT: Thank you.