You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking a flight ticket from Houston, HOU to reach Washington, IAD?

ASSISTANT: Sure, I am here to help you. May I know your planned trip dates?

USER: My journey dates are from Aug 11 to Aug 13.

ASSISTANT: Do you have any connection limit preference?

USER: I need a connection in between journey.

ASSISTANT: Do you have any class preference?

USER: I am ok with any class.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Do you have any specific time preference?

USER: My return time is afternoon.

ASSISTANT: Could you help me with your name please?

USER: My name is Patrick Evans.

ASSISTANT: Patrick Evans, regret to inform that there is no afternoon flight available for the given dates.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for reaching our agency.