You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Brian Gonzalez here.

ASSISTANT: Welcome to flight booking agency Brain.

USER: I would like to visit Space Center in Houston. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you. Could you please provide your preferable dates that you want to travel?

USER: My departure date is 06/11 and return date is 06/13.

ASSISTANT: Please share your origin and destination airport codes for booking.

USER: My airport codes are from MN-MSP to TX-HOU.

ASSISTANT: Please wait a moment to check the flights.

USER: Ok, my price limit is 500.

ASSISTANT: Sorry to inform you that, there are no flights running to your location with your requested dates of travelling.

USER: So sad for that. Anyway, thank you for the information.

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