You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Jennifer Mitchell. I am planning to visit my brother's home from DCA to SFO. Can you help me to book a ticket for me?

ASSISTANT: Sure, I'll help you. May I know your trip dates?

USER: Sure, my travelling dates are 03/15 to 03/17. Make sure my connection limit is 1.

ASSISTANT: Sorry Jennifer, there is no flight available with your details.

USER: That's fine. Thank you for your help.

ASSISTANT: Most welcome.