You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: Can you please help me in booking a flight ticket from Houston, IAH to Washington, DCA?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your travel dates?

USER: My journey dates are from June 07 to June 09.

ASSISTANT: Is there any class preference?

USER: I am ok with any class.

ASSISTANT: Do you need any break in your journey?

USER: I need a lay by in between journey.

ASSISTANT: Do you have any other requirements?

USER: My depart time is afternoon.

ASSISTANT: May I know your name please?

USER: My name is Patricia Nelson.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

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

ASSISTANT: Thank you for reaching us.