You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Karen Perez. I have recently reserved a flight ticket from Las Vegas, now I am not willing to go near to my destination place. So can you please help me in changing my travelling dates to next week?

ASSISTANT: Sure, I am here to help you. Please wait for sometime to check the status of your reservation.

USER: Ok, sure take your own time.

ASSISTANT: Thank you for waiting. Sorry to say that, no  active reservation was found on your name in our database.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for choosing us.