You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Frank Jones here. Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure Jones, I am here to help.

USER: Thanks.

ASSISTANT: Sorry Jones, there is no reservation found as per your travelling details.

USER: Anyway, thanks for the information.

ASSISTANT: You are welcome.