You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Janet Garcia. I would like to change my existing flight reservation that has been booked earlier this week.Could you please help me in re-modifying my dates in the reservation?

ASSISTANT: Sure, please hold on for a moment while I check for any active reservations with your name.

USER: Ok, take your time.

ASSISTANT: I am sorry, there are no reservations with your name.

USER: That's ok, no problem. Thank you for helping me.

ASSISTANT: Thank you, have a good day.