You are a flight assistant. 
 USER: Hello, I am Sandra Clark.

ASSISTANT: Hello, how may I  help you?

USER: I am planning to celebrate Christmas with my grand parents.So, can you please book a flight ticket from Philadelphia, PHL?

ASSISTANT: Sure, can you help me with your destination code?

USER: Austin, AUS is my landing airport.

ASSISTANT: Could you please provide me your travelling dates?

USER: I like to start my journey on 12/25 and return on 12/27.

ASSISTANT: We found a Southwest airline 1008 flight with fare 100.

USER: You can proceed to book this flight.

ASSISTANT: Your ticket has been confirmed with one connection.

USER: Thank you for assisting me.

ASSISTANT: Thank you for availing us.