You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Kathleen Roberts.

ASSISTANT: How may I aid you?

USER: I need to attend a meeting in Las Vegas, can you please make a reservation from  DCA?

ASSISTANT: Sure, may I know on what dates would you like to travel?

USER: My journey dates are, depart on Mar 31st and return on Apr 2nd.

ASSISTANT: Can you please provide me your destination airport code?

USER: My destination airport code is LAS.

ASSISTANT: May I know your connection limit?

USER: I need a connection in between journey.

ASSISTANT: Is there any airline preferences?

USER: No.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there are no flights found on your trip dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.