You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER:  Being a doctor I need to fly to Las Vegas, to attend in world health conference. Can you help me to book a direct flight?

ASSISTANT: Sure, Please provide me your travel dates.

USER: I would like to travel on 01/03 and 01/05.

ASSISTANT: Can I have your journey points?

USER: My origin and destination are: DCA and LAS.

ASSISTANT: Sorry for the inconvenience, there are no flights found with your requirement.

USER: Ok, no problem.

ASSISTANT: May I know your name for documentation purpose?

USER: I am Dorothy Young.

ASSISTANT: have a nice day.

USER: Thanks for the quick response.