You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what help can I do for you?

USER: I am Charles Allen. Could you please help me to book a  flight to HOU from IAH?

ASSISTANT: Sure, may I know your travelling dates?

USER: I would like to travel on 02/21 to 02/23.

ASSISTANT: As per your request, there is a flight 1004 of UA airlines available for you. Shall I confirm your booking?

USER: Please proceed.

ASSISTANT: Your ticket is booked successfully.

USER: Thank you for the booking.

ASSISTANT: Thank you for using our service to fly.