You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: Due to inconvenience of my work, I am unable to travel on the dates of my previous reservation. Can you please help me for change my reservation?

ASSISTANT: Sure, we are here to help you. May I know your name please?

USER: My name is Jason Adams.

ASSISTANT: Sorry to inform you that there is no active reservation found on your given name.

USER: Anyway, thanks for the information.

ASSISTANT: Thanks for contacting us.