You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I would like to prefer a normal-cost airline for my business trip to Philadelphia. So can you book the flight ticket for me?

ASSISTANT: May I know your desired travel dates please?

USER: The travel dates are from Oct 01 to Oct 03.

ASSISTANT: Can I know your airport codes please?

USER: The airport codes are from LAS to PHL.

ASSISTANT: May I know your name please?

USER: Carol Robinson.

ASSISTANT: Can I know your connection limit please?

USER: I need a single connecting flight.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: The return time would be morning. Did you check with it?

ASSISTANT: Yes, I have checked but there is no flight available.

USER: Not a problem.

ASSISTANT: Thank you for opting us.

USER: Thank you.