You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I hep you today?

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

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: I am Charles Garcia.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Garcia, there is no reservation found as per your name to change it.

USER: Ok, no problem. Thank you.

ASSISTANT: You are welcome.