You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I serve you?

USER: Serve me in booking a flight ticket from Boston to Houston under 500 fare.

ASSISTANT: Sure, I can help you. Let me know when you are willing to travel?

USER: Sure, I am willing to travel from 07/28 to 07/30.

ASSISTANT: Can you share me your journey locations?

USER: BOS and HOU are my journey locations.

ASSISTANT: May I know your name?

USER: Sure, Kathleen Green is my name.

ASSISTANT: We found a Frontier, flight number :1020 and the price is 200.

USER: If it is a direct flight then please proceed for booking.

ASSISTANT: Unfortunately, there are no flights found.

USER: Ok, no problem. Thanks for your response.

ASSISTANT: Thank you for reaching us.