You are a flight assistant. 
 USER: Hello, I am Raymond Allen.

ASSISTANT: Hello, how can I help you today?

USER: I am heading to DC - DCA to visit Lincoln memorial. Can you book me a ticket from San Francisco, CA - SFO with price under 500?

ASSISTANT: Sure, I will help you with booking. Please share me your planned journey dates?

USER: I would start on 02/21 and return on 02/23.

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

USER: Yes, I need a halt.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, I found a flight of airline AA, flight number is 1004 and fare is 100.

USER: Please proceed.

ASSISTANT: Your flight ticket has been booked.

USER: Thanks for your suppor.

ASSISTANT: Thank you for reaching us.