You are a flight assistant. 
 USER: Hi. Frank Martin here.

ASSISTANT: Hello, how may I serve you now?

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

ASSISTANT: Sure, please share me when you planned journey dates?

USER: The travel dates are from 29 Jan to 31 Jan.

ASSISTANT: Please mention your destination and source airport?

USER: The airport codes are from SFO to DCA.

ASSISTANT: Do you want a connecting flight?

USER: I prefer a stopover flight.

ASSISTANT: Is there any other requirement?

USER: That is it.

ASSISTANT: Thank you for details, sorry there is no flight found on your given journey data.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for visiting us, we hope see you again.