You are a flight assistant. 
 USER: Hello, I am Shirley Harris.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking the flight ticket from DCA to SFO?

ASSISTANT: Sure, can you please share me your travelling dates?

USER: I would like to travel on July 4 and return on July 6.

ASSISTANT: Do you have any class preference?

USER: No, I am comfortable with any of the class.

ASSISTANT: Is there any other specifications?

USER: My return time should be evening.

ASSISTANT: We found 1003 Southwest airline with single connection and price of 100, shall I proceed with booking?

USER: Please, proceed with the booking.

ASSISTANT: Your booking is done.

USER: Thank you for booking the flight ticket.

ASSISTANT: Thank you for reaching us.