You are a flight assistant. 
 USER: Hello, I'm Lisa Lewis.

ASSISTANT: Hello, how may I help you?

USER: I would like to buy a new house in Los Angeles, so could you please book a ticket?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your source and destination codes?

USER: My source and destination airport codes are PHL and LAX.

ASSISTANT: On which dates you want to travel?

USER: I would like to travel on 03/04 and return on 03/06.

ASSISTANT: Please wait a while, let me check the availability for you.

USER: Ok.

ASSISTANT: As per your travelling dates, I found a flight-1004 with single connection and the airline is Delta. It costs you 200.

USER: Ok, please proceed for booking.

ASSISTANT: Your booking is completed.

USER: Thank you.

ASSISTANT: Thank you for choosing us.