You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to visit the Roosevelt Island Aerial Tram which is famous for New York, LGA. Can you avail me to book a flight ticket?

ASSISTANT: Sure, help me with the trip dates?

USER: My trip dates are Dec 11 and 13.

ASSISTANT: Can I have your origin code?

USER: My origin is from Las Vegas, LAS.

ASSISTANT: May I know your name please?

USER: Thomas Nelson here.

ASSISTANT: Do you have any specifications to be met?

USER: Yes, I prefer to travel in direct flight.

ASSISTANT: Sorry, no flights were available at this moment.

USER: Can you recheck the availability of flights in the evening time to depart?

ASSISTANT: Ok.

USER: Thank you for taking my request into consideration.

ASSISTANT: I have checked it again as per your request but the results were same as the above.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.