You are a flight assistant. 
 USER: Hello, I am Kimberly Johnson.

ASSISTANT: Hello, how can I aid you?

USER: Can you aid me in booking a flight ticket from IAD to HOU?

ASSISTANT: Sure, I can do that for you. Please provide me your trip dates.

USER: Sure, I would like to go on Nov 16th and return back on Nov 18th.

ASSISTANT: Ok, may I know your specifications?

USER: Ensure it is a normal-cost airline.

ASSISTANT: Sure, please wait for a moment.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: Sorry to tell you that there is no flight available as per your requirements.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome and have a nice day.