You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, good morning. Welcome to flight booking agency, how may I help you for today?

USER: I am Dorothy Parker, in my previous reservation I gave wrong airport codes so can you help for changing an existing reservation?

ASSISTANT: Sure, I am here to help you. Please give me a moment to check your details in my records.

USER: Ok, I wait for your response.

ASSISTANT: I have found your reservation, can you help me with your travelling dates?

USER: I am going to start my journey on 08/29 and I am going to return on 08/31.

ASSISTANT: May I know your preferred airport codes?

USER: My origin airport code LGA and destination airport code DCA.

ASSISTANT: Thank you for your details, Please wait for a moment to check the availability of flights.

USER: Ok, but provide flight with connection 1.

ASSISTANT: Sure, flight -1005 of Southwest airline is available for you. Shall I proceed with booking?

USER: Oh! That's really great, proceed to booking.

ASSISTANT: Ok, your ticket has been confirmed. Have a nice day.

USER: Thank you for confirming my flight ticket in Southwest airline.

ASSISTANT: You are welcome.