You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I aid you today?

USER: I need a direct flight to attend my friend's birthday party in Las Vegas, NV - LAS. Can you be my helping hand in booking a flight ticket?

ASSISTANT: Sure, please share your source airport code.

USER: I will start from Washington, DC - DCA.

ASSISTANT: Is there any stopover you prefer?

USER: Yes, I need a direct flight.

ASSISTANT: Ok, may I know your travelling dates?

USER: I will fly on 07/05 and recur on 07/07.

ASSISTANT: Ok, give me a minute.

USER: Sure.

ASSISTANT: Thank you for your time. Let me know your good name please.

USER: Myself Kevin Moore.

ASSISTANT: Ok, there is no flight found matching with your specifications.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.