You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Debra Wilson here. I want to travel from Washington to San Francisco for attending Seminar. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, can you share your journey dates?

USER: My travelling dates are from 03/23 to 03/25.

ASSISTANT: Can you provide your airport codes for booking?

USER: My airport codes are from DCA to SFO. Make sure my connections limit is 0.

ASSISTANT: Sorry, there is no direct flight found on your given dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.