You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: Please help me in booking flight ticket from CLT to LAS to attend meeting.

ASSISTANT: May I know your name?

USER: Raymond Clark.

ASSISTANT: Do you prefer a direct or connecting flight?

USER: I need a connecting flight.

ASSISTANT: May I know on what dates would you like to travel?

USER: My trip dates are Jan 16 to Jan 18.

ASSISTANT: Do you have any other requirements to be met?

USER: My depart should be in the evening.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thank you.