You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How could I aid you today?

USER: Can you please help me in booking a flight ticket to LAS from DCA?

ASSISTANT: Sure, I will help you in booking.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: My travel dates are from Jan 03 to Jan 05.

ASSISTANT: Kindly mention your specifications please?

USER: I need a connecting flight.

ASSISTANT: We are sorry to inform you that there is no flight found with your matching information.

USER: Ok, no problem.

ASSISTANT: May I know your name please?

USER: I am Jason Williams.

ASSISTANT: Thank you for approaching us.

USER: Thank you.