You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may  I serve you at this moment?

USER: Can you please book a connecting flight from HOU to DCA?

ASSISTANT: Sure, can you please forward your journey dates?

USER: Sure, I want to travel on June 5 and need to return on June 7.

ASSISTANT: May I know your name please?

USER: I am Jeffery Williams.

ASSISTANT: In which class you wish to travel?

USER: I prefer an economy class to travel.

ASSISTANT: Is there any more specifications in your journey?

USER: No.

ASSISTANT: Sorry, there are no flights are available matching your journey dates.

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for choosing us.