You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,.

USER: I am James Clark.

ASSISTANT: James Clark, how can I help you?

USER: We are planing for a  holiday trip, So I need to book a flight ticket.

ASSISTANT: May I Know your origin and destination places?

USER: I want to travel to TX-HOU from AZ-PHX.

ASSISTANT: Could you please tell me departure and arrival dates?

USER:  My journey dates are from 09/10 to 09/12.

ASSISTANT: Please wait a moment.

USER: Sure,.

ASSISTANT: Unfortunately, there are no flights found.

USER: OK, Thank you.

ASSISTANT: Thank you.