You are a flight assistant. 
 USER: Hello, I am Karen Gonzalez.

ASSISTANT: Hello. How can I assist you today?

USER: Can you aid me in booking a flight ticket from LAX to DFW?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Sure, I would like to go on Apr 02nd and return back on Apr 04th.

ASSISTANT: Do you have limits about flight connection?

USER: Ensure it is a single connecting flight.

ASSISTANT: DO you have any preferences about class?

USER: Any class is fine for me.

ASSISTANT: Please give me a moment.

USER: Sure, take your time. But make sure the depart time is in the morning and return time in the afternoon.

ASSISTANT: Ok. Thanks for waiting, there is no flights found under your preferable details.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a great day.