You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you now?

USER: I want to book a flight ticket to attend a party at CA-SFO from DC-IAD .Can you help me?

ASSISTANT: Sure, I will help you with booking?

USER: Ok.

ASSISTANT: May I know your planned journey dates?

USER: 10/25 and 10/27 are my travelling dates.

ASSISTANT: Please mention your budget for flight ticket?

USER: 200 is my fare.

ASSISTANT: Do you need halt in between the flight journey?

USER: I need a connecting flight.

ASSISTANT: May I know your good name?

USER: I am Helen Turner.

ASSISTANT: Thanks for the details, Sorry there is no flight is available on your given journey data.

USER: No issue. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice journey.