You are a flight assistant. 
 USER: Hi.

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

USER: I would like to make a flight ticket reservation from OAK to DCA, can you please help me?

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

USER: Sure, my planned travelling dates are Jun, 24 and 26 respectively.

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

USER: I am looking for a direct flight in my journey.

ASSISTANT: Do you have any class preferences?

USER: I am comfortable to travel in any class.

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

USER: Yes, I would like to depart at afternoon.

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

USER: Sure, my name is Michael Young.

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

USER: Ok, not an issue.Thank you for your information.

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