You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I planned to meet my friend in LGA, can you please help me to book a flight ticket from HOU?

ASSISTANT: Sure, I'm glad to help you with that. May I know on which dates are you planning to depart and arrive?

USER: I prefer to travel on May 31 and Jun 02.

ASSISTANT: Do you prefer stopover in between your journey?

USER: I need a direct flight.

ASSISTANT: Please let me know if you have any other specifications.

USER: I would like to travel in normal cost airline.

ASSISTANT: May I know your good name please?

USER: I am Melissa Hill.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates with your given details.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us, have a nice day.