You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Helen Allen, I am planning to start a school for the poor children, for documentary purpose, I need to go to Las- Vegas, help me in booking my  flight ticket from Houston.

ASSISTANT: That's great! I'll help you in that, can you please help me with your airport codes?

USER: I am heading from TX-HOU, my landing point is at NV-LAS.

ASSISTANT: May I know your journey dates please?

USER: My planned travelling dates are 07/30 to 08/01.

ASSISTANT: Delta airlines is having a flight with travel charge of 100, shall I proceed for booking?

USER: Please go ahead with booking.

ASSISTANT: Your ticket has been booked with flight-1001, have a safe journey.

USER: Thank you for your service.

ASSISTANT: Thank you so much for choosing us.