You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Laura Perez. Can you book a flight ticket from DEN to LGA?

ASSISTANT: Sure, we are perky to serve you.

USER: Thank you.

ASSISTANT: Can you share me your trip dates?

USER: Jan, 21 and Jan, 23 are my planned travel dates.

ASSISTANT: Do you need any flag stop in your journey?

USER: Yes, I need a flag stop.

ASSISTANT: May I know your depart time and arrival time?

USER: Make sure that both depart and return time should be at evening.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: That's ok, not an issues.

ASSISTANT: Thank you for choosing us.

USER: Thank you.