You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to visit Space Needle in Seattle with my friends on 04/23. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, can I know the take off and landing airport codes please?

USER: The take off airport is from NY-LGA and the landing airport code is WA-SEA.

ASSISTANT: May I know your name and return dates please?

USER: Sure, my return date is 04/25.

ASSISTANT: Ok.

USER: Please book the ticket on the name of Robert Thomas.

ASSISTANT: Ok, wait a moment please.

USER: Sure, make sure that the price should not be more than 200.

ASSISTANT: Sorry Thomas, there are no flights on your dates.

USER: No problem, I will search another way to complete my trip.

ASSISTANT: Thank you for choosing us.

USER: Thank you.