You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Janet Harris want to change my reservation due to prepone  of my shooting dates. Can you please help me in changing my reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there was no reservation found with your name.

USER: Thank you for your response.

ASSISTANT: Thank you for opting us.