You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Ruth Young here.

ASSISTANT: How can I assist you today?

USER: I am looking for a flight ticket with evening as the depart time. So can you book it for me?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: The travel dates are from Jan 03 to Jan 05.

ASSISTANT: Please provide your airport codes.

USER: The airport codes are from DCA to JFK.

ASSISTANT: Do you have any preferences about flight connections?

USER: I prefer a stopover flight.

ASSISTANT: Do you have any preferences about class?

USER: No.

ASSISTANT: Please mention your name.

USER: I am Ruth Young.

ASSISTANT: There is no flights found under your preferable details.

USER: Not a problem. Thank you.

ASSISTANT: Welcome, have a great day.