You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you?

USER: Due sudden demise of my grandfather, I need to change my reservation. Can you help please help me?

ASSISTANT: Ok, may I know your name?

USER: I am Betty Green.

ASSISTANT: Sorry, there is no reservation found in your provided name.

USER: Ok, not an issue.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your response.