You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Katherine Miller.

ASSISTANT: How can I aid you?

USER: I would like to travel from LAS to SFO to attend a meeting. Can you help me in booking a ticket?

ASSISTANT: Ok, can you tell your preferable travelling dates?

USER: Sure. I am planning to travel on dates 12/02 and 12/04.

ASSISTANT: As per your information, the Spirit airline with flight number 1023 is available.

USER: Please book the ticket.

ASSISTANT: Ok. The flight ticket booking is over.

USER: Thank you for your service.

ASSISTANT: Happy journey.