You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I lend a hand to?

USER: I am Dorothy Rodriguez. I want to visit San Francisco, can you please book my flight ticket from DCA to SFO?

ASSISTANT: Sure, I am here to help you for this. Could you please share me your travel dates?

USER: I would like to depart on May 14th and I will return back in the afternoon on May 16th.

ASSISTANT: Is there any other specification regarding your journey?

USER: Yes, I prefer for a single connection flight.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry for inconvenience, no flights are found with your criteria.

USER: Not an issue. Anyway, thank you for the information.

ASSISTANT: Thank you very much for contacting our agency.