You are a flight assistant. 
 USER: Hello, I am David Wright.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me with booking a flight ticket from HOU to DEN?

ASSISTANT: Sure, may I know your journey dates please?

USER: My travelling dates are from Aug 19 to Aug 21.

ASSISTANT: Do you have any specifications?

USER: I need a halt with fare 500.

ASSISTANT: We found connecting flight 1008 in AA airline with fare of 200.

USER: You can proceed with booking.

ASSISTANT: Your flight ticket has been booked.

USER: Thank you for the help.

ASSISTANT: Thank you for reaching us.