You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am planning to travel from IAH to LAS, help me in booking a flight?

ASSISTANT: Can I know your travelling dates.

USER: My travelling dates are Apr 21 to 23.

ASSISTANT: Do you have any preference?

USER: I prefer to travel in connection flight.

ASSISTANT: Let me know your name.

USER: I am Joseph Martin.

ASSISTANT: Direct flight is found with American airlines for price 100.

USER: Proceed for booking.

ASSISTANT: Ticket is booked having flight number 1000.

USER: Thank you.

ASSISTANT: Thank you.