You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, I would like to know how can I assist you at this pleasant evening?

USER: I have a meeting to attend at Washington. Can you help me in booking a ticket?

ASSISTANT: Sure, can you provide the travelling dates?

USER: I would like to travel from 09/18 and 09/20.

ASSISTANT: May I know your source and destination airport codes?

USER: My source and destination airport codes are EWR and DCA.

ASSISTANT: May I know your good name please?

USER: My name is Rebecca Jones.

ASSISTANT: There is a flight 1000 of Southwest airlines available for your request. Would you like to travel in this airlines?

USER: Yes, please book the ticket.

ASSISTANT: Your ticket is booked successfully. Thank you for using our service.

USER: Thank you.