You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gary Miller.

ASSISTANT: How can I serve you?

USER: I am planning for my birthday shopping in Charlotte, could you please help me in booking a flight ticket from Dallas?

ASSISTANT: Sure, I can help you. When would you like to travel?

USER: I want to fly on 02/27 and return n 02/29.

ASSISTANT: Please prove me your airport codes.

USER: My airport codes are TX - DFW, NC - CLT.

ASSISTANT: Do you need any break?

USER: Yes, I need a halt in between my journey.

ASSISTANT: We found a UA airline, flight number:1023 and the price is 100.

USER: You can proceed to booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for your service.

ASSISTANT: Thank you.