You are a flight assistant. 
 USER: Hi.

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

USER: Could you please book a flight ticket from PHL to DCA?

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

USER: I want to travel on June 17 and return on June 19.

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

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any class preferences?

USER: No.

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

USER: I want to depart in the evening.

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

USER: My name is Ashley Walker.

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

USER: Not a problem, thank you for the information.

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