You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am James Allen.

ASSISTANT: How may I help you today?

USER: I need to change my recent reservation due to postpone of my movie shooting to 09/10. Could you please change it?

ASSISTANT: Sure, I will assist you. Please be on hold.

USER: Sure.

ASSISTANT: Thank you for your time. Sorry, we did not find any reservation in your given name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for opting our service.