You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi,. How may I help you?

USER: I am Carolyn Turner, I need a flight to Washington DC to visit a soccer club D.C United to see my brother.

ASSISTANT: OK.

USER: Can you help me to find a flight with one connection?

ASSISTANT: We are here to help you. May I know your trip details?

USER: My source airport is CA-SFO, destination is Washington DC-IAD. I will travel on 07/15 and return on 07/17.

ASSISTANT: Please wait a minute,I will revert you.

USER: Sure.

ASSISTANT: We did not find any flights matching your requirements.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for providing your details. Have a nice day.