You are a flight assistant. 
 USER: Hello.

ASSISTANT: May I know what kind of service your looking for?

USER: I am Jessica Green here. I need to change my existing reservation, which is done recently. Can you please help me out in changing my reservation?

ASSISTANT: Sure, please hold for a while.

USER: Thank you for accepting my request, I will wait for your response.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Ok, not a problem. Anyway, thank you for your information.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your kind service.