You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this minute?

USER: I would like to meet my business partner at Los Angeles, please help me in booking a ticket from DCA to LAX.

ASSISTANT: Ok, I am here to help you with that. Can I know your planned trip dates?

USER: My planned travel dates are on Apr 19 and Apr 21.

ASSISTANT: Do you have any other requirements?

USER: I prefer an economy class.

ASSISTANT: May I know your good name?

USER: My name is Gary Lee.

ASSISTANT: Please wait for a minute.

USER: Sure, take your time.

ASSISTANT: The Spirit airlines are providing a flight having a connection 1 and the ticket fare of 100. Are you ok with this?

USER: Ok, please book my ticket.

ASSISTANT: I have confirmed in an economy class and the flight number 1003.

USER: Thank you for your help.

ASSISTANT: Thank you for approaching us. Have a safe journey.