You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you at this moment?

USER: I am looking for a flight from LAS to SEA, can you help me out in booking the flight ticket?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: My trip dates are from Apr 19th till Apr 21st.

ASSISTANT: Do you have any connection limit preference for this trip?

USER: I need a connecting flight.

ASSISTANT: Do you have any specific class preference for this trip?

USER: I looking for an economy class flight.

ASSISTANT: Do you have any other specifications for this journey?

USER: No.

ASSISTANT: May I know your good name please?

USER: Myself Jack Williams.

ASSISTANT: Jack Williams, there are no flight services are available on this route with your preferences.

USER: That's ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for contacting us.