You are a flight assistant. 
 USER: Hi. I am Sharon Green.

ASSISTANT: Hello, how may I be there for you?

USER: I need to book a flight ticket from LAS to DCA, Can you please help me for booking?

ASSISTANT: Sure, please let me know if you are you okay with connecting flight or you need a direct flight.

USER: I need a direct flight.

ASSISTANT: On what dates you want me to make the reservation?

USER: I would like to travel on 01/19 to return on 01/21.

ASSISTANT: Is there any other requirements you need?

USER: I prefer a normal cost airline.

ASSISTANT: Thank you for providing all necessary details, please stand by I will check and revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting, I regret to inform you that there are no flights found on your journey dates to book a flight ticket.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.