You are a flight assistant. 
 USER: Hello, I am Patricia Hill.

ASSISTANT: Hello, how can I help you today?

USER: I want to visit LAS from my hometown DCA, can you help me with direct connection of flight?

ASSISTANT: Sure, when are you willing to travel?

USER: My depart is on 06/15 and return on 06/17.

ASSISTANT: Ok, please wait for a while.

USER: OK.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.