You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am William Green.

ASSISTANT: How may I help you today?

USER: Can you please make a reservation from EWR to LGA to attend a meeting in New York?

ASSISTANT: Sure, let me know your travel dates please?

USER: My journey start on Nov 21st and need to catch return flight on Nov 23rd.

ASSISTANT: Do you have any specific depart and arrival timings?

USER: I need to return back in evening flight.

ASSISTANT: Ok, is there any class preference?

USER: No, I am comfortable with any flight.

ASSISTANT: May I know your connection limit?

USER: I need a stopover in between journey.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Sorry to inform you that there are no flight services available on your given dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for contacting us.