You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you help me in booking flight ticket from LAS to EWR?

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

USER: My trip dates are July 05 to July 07.

ASSISTANT: May I know your connection limit?

USER: I prefer to travel in connecting flight.

ASSISTANT: Do you have any time concern?

USER: No.

ASSISTANT: Ok, is there any class preference?

USER: No.

ASSISTANT: Do you need any airline preference?

USER: No, I don't have any other specifications other than I mentioned above.

ASSISTANT: Can I know your name please?

USER: Andrew Williams here.

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

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thanks for contacting us.