You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you aid me to book a flight ticket from LAS to EWR?

ASSISTANT: Sure, please share your planned travel dates?

USER: I planned my trip on the dates Sept 23 and Sept 25.

ASSISTANT: Do you have any connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: Any other preferences?

USER: I prefer evening flight at the time of depart and as well as for my return journey.

ASSISTANT: Can I have your name please?

USER: Myself Helen Thompson.

ASSISTANT: Sorry, no flights found with your given details.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thank you for opting us.