You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Can you please book me a plane ticket in a flight that departs in the evening?

ASSISTANT: Sure, May I know the travelling dates?

USER: I will leave on Dec 16th and arrive on Dec 18.

ASSISTANT: Please help me with your journey codes.

USER: My origin is MSP and  destination is IAH.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a direct flight.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: I am Joseph Parker.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's alright thanks for your response.

ASSISTANT: Thank you for opting us.