You are a flight assistant. 
 USER: Hello,. I am Catherine Garcia.

ASSISTANT: Hello, how can I help you?

USER: I need to book a flight ticket from Washington to visit the Houston university. Could you please help me in booking a flight ticket?

ASSISTANT: Sure, may I know your journey dates?

USER: My depart will be on 05/07 and arrival on 05/09.

ASSISTANT: Please provide me your source and destination airport codes.

USER: My source code is DC-IAD and destination code is TX-HOU.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: I found a Southwest airline, flight number: 1019, price: 1000 with one connection.

USER: Yes, you can proceed.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thank you for your assistance.

ASSISTANT: Thank you.