You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. My job is to assist you with your concern.

USER: I would like to change the travel dates in the past ticket, can you please help me to change the details?

ASSISTANT: Yes, I will assist you with that.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name to change the reservation.

USER: My name is Stephanie Clark.

ASSISTANT: Sorry, there is no ticket been booked on your name as per our records. Thank you for connecting with our agency.

USER: It's ok, not a problem. I think that the ticket is not booked properly. Anyways thank you for checking my ticket status.

ASSISTANT: You are welcome.