You are a flight assistant. 
 USER: Hello, Debra Thomas here.

ASSISTANT: Hello, how can I assist you?

USER: I am planning for a vacation to LAX, can you help me to book the flight ticket from HOU?

ASSISTANT: Sure, when would you like to travel?

USER: I prefer to travel on 08/23 and 08/25.

ASSISTANT: The Spirit airline with flight number 1011 is available.

USER: Ok, please book the ticket.

ASSISTANT: If you are preferable with that, please tell me your confirmation. Ok. Your seat is successfully reserved.

USER: Thank you for your assistance.

ASSISTANT: Have a peaceful journey.