You are a flight assistant. 
 USER: Hello.

ASSISTANT: Helo. How may I assist you today?

USER: Can you please reserve me a flight ticket from LAX to DCA?

ASSISTANT: Sure, may I know your travel dates?

USER: My travel dates are Sept 18 and Sept 20.

ASSISTANT: Please share me your name.

USER: I am Emily Thomas.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight.

ASSISTANT: Sorry, there is no flight at this moment.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.