You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: Will you please help me in searching a flight ticket from IAD to LAX?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My trip dates a Apr 06 and Apr 08.

ASSISTANT: Are you looking for a connecting flight or direct flight?

USER: I prefer direct flight.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I need my depart flight at afternoon and my return ticket at morning time.

ASSISTANT: Can you please provide your name to proceed further?

USER: Myself Robert Walker.

ASSISTANT: Sorry, there are no flights available at your request.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for contacting us, have a nice day.