You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

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

ASSISTANT: Sure, I am glad to help you with that.

USER: Ok.

ASSISTANT: Can you please provide your preferable dates of travelling?

USER: The trip dates are from Aug 18 to Aug 20.

ASSISTANT: Ok, may I know your regional airports for booking?

USER: The airport codes are from MSP to IAH.

ASSISTANT: Do you have any connection limit?

USER: I prefer a stopover flight.

ASSISTANT: Any more specifications do you have?

USER: No, that is it.

ASSISTANT: Please wait a moment to check the flights.

USER: Sure.

ASSISTANT: We regret to inform you that, there are no flights moving to your region with your requested dates of travelling.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for approaching us, have a great day.