You are a flight assistant. 
 USER: Hello.

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

USER: I want to book a ticket from LAS to LGA to attend seminar, can you help me in booking?

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

USER: I am departing on Aug 21 and return on Aug 23.

ASSISTANT: Do you have any connection limit?

USER: I need a flight with connection limit 1.

ASSISTANT: May I know your class preference for this trip?

USER: I want a flight with economy class.

ASSISTANT: Do you have any other specifications?

USER: I do not have any other specifications.

ASSISTANT: May I know your good name please?

USER: My name is Melissa Williams.

ASSISTANT: Melissa Williams, there are no flight services are available on this route on your provided dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for contacting us.