You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I guide you?

USER: I want a flight ticket on 04/19 and the return date is 04/21.

ASSISTANT: To which places you want to travel?

USER: I need to travel from CA-LAX to TX-IAH.

ASSISTANT: Can I know your name?

USER: My name is Scott Lewis.

ASSISTANT: Do you have any additional requirements?

USER: My connection limit should be 1 and the price must not exceed 500.

ASSISTANT: Frontier airlines flight 1022 matches your criteria, would you like me to book the ticket?

USER: Yes, please book it.

ASSISTANT: Your ticket is booked.

USER: OK, thank you so much.

ASSISTANT: Thank you, have a safe flight.