You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Charles Jones on this side.

ASSISTANT: Charles Jones, how may I aid you?

USER: I was planning to meet my father who owns a chocolate factory in San Francisco. So, can you please check for the flights from DCA to SFO?

ASSISTANT: Sure, please provide your trip dates.

USER: My journey dates will be on June 11th and return back on June 13th. I need a direct flight.

ASSISTANT: Please wait for a while.

USER: I would prefer a normal cost airlines.

ASSISTANT: Sorry, no direct flight is available on your route.

USER: Oh! That's very disappointing to know. Anyways, thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: You are most welcome.