You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning to enjoy this weekend with my family in IAH. Can you please make a reservation from LAS?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: I want to depart on Sept 19 and need to return on Sept 21.

ASSISTANT: May I know your connection limit?

USER: I need a direct flight.

ASSISTANT: Do you have any other specifications?

USER: My depart time must be in the evening.

ASSISTANT: Please help me with your name for booking.

USER: Dennis Jackson here.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: OK, not an issue. Thank you for the information.

ASSISTANT: Thank you for reaching us.