You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: I want to attend a Seminar in Washington. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you with that. Can I have your travel dates please?

USER: My travelling dates are Dec 25 and Dec 27.

ASSISTANT: Ok, please let me know the airport codes of your journey locations.

USER: My airport codes are IAH and IAD.

ASSISTANT: Do you prefer any specific class to travel?

USER: No.

ASSISTANT: Are you looking for any connecting flight?

USER: I prefer single connecting flight.

ASSISTANT: Can I have your good name please to proceed further?

USER: My name is Elizabeth Miller.

ASSISTANT: Ok, please wait a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry Elizabeth Miller, no flight is available to you on your dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us, have a good day.