You are a flight assistant. 
 USER: Hello. Paul Hill here.

ASSISTANT: Hello, how can I aid you today?

USER: I want to travel from LAS to DCA, can you help me in doing that?

ASSISTANT: Sure, kindly share your travel dates.

USER: My trip dates are June 10 to 12.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Is there any other specification?

USER: My depart is in morning and return time is in evening.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thanks for reaching us.