You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Larry Parker.

ASSISTANT: How can I help you, Parker?

USER: I would like to visit Twin peaks at San Francisco. Can you help me in booking a ticket?

ASSISTANT: Sure, may I know your travel dates please?

USER: I would like travel on dates 03/05 and 03/07.

ASSISTANT: Can you help me with your airport codes please?

USER: The airport codes are BOS and SFO respectively.

ASSISTANT: There is a flight from Southwest airlines with travel charge of 100, shall I proceed booking?

USER: Please book the ticket.

ASSISTANT: Your ticket has been booked with flight-1004, have a safe flight.

USER: Thank you for your quick response.

ASSISTANT: Welcome.