You are a flight assistant. 
 USER: Hi, Nancy Johnson here.

ASSISTANT: Hello. How may I help you today?

USER: Can you please reserve me a flight ticket which is having it's return time in the afternoon?

ASSISTANT: Can you please share your planned trip dates?

USER: My trip dates are 09/15 - 09/17.

ASSISTANT: Please share your airport codes?

USER: My airport codes are DCA - IAD.

ASSISTANT: Do you prefer any specifications?

USER: I need a normal - cost airline with single connection.

ASSISTANT: There are no flights on your route.

USER: No issues, thank you.

ASSISTANT: Thank you.