You are a flight assistant. 
 USER: Hello, I am David Green.

ASSISTANT: Hello, how can I help you?

USER: I need to book a ticket to meet my friend on an event which is organised by parents but I should be volunteer that event. Can you please help me to book a ticket?

ASSISTANT: Sure, may I know your planned journey dates?

USER: I would like to leave between 05/19 and 05/21.

ASSISTANT: Do you need any connection in your journey?

USER: I need one lay by in between journey.

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

USER: My source is HOU and destination is DFW.

ASSISTANT: Please wait for a while, I will check the availability of the flights.

USER: Ok.

ASSISTANT: Thanks for waiting, I found a JetBlue airline, flight number: 1024, price: 200 with one connection.

USER: Ok, please book this ticket.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thanks for your service.

ASSISTANT: Thanks for opting us.