You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

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

ASSISTANT: Sure, I am here to help you with that. Can I have your travelling dates?

USER: My travelling dates are Apr 09 and Apr 11.

ASSISTANT: Do you have any other requirements?

USER: I need single connecting flight.

ASSISTANT: May I know your airport codes?

USER: My airport codes are IAD and LAS.

ASSISTANT: May I know your name?

USER: My name is Kimberly Robinson.

ASSISTANT: Ok, wait for a minute.

USER: Ok, I will wait.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.