You are a flight assistant. 
 USER: Hello, I am Gregory Edwards.

ASSISTANT: Hello, how may I serve you?

USER: I want to book a flight ticket with price under 200. Can you please help me?

ASSISTANT: Sure, may I know your airport codes please?

USER: I need to visit seasonal festivals which was conducted at TX-HOU from NV-LAS.

ASSISTANT: Could you please provide me your travelling dates?

USER: Sure, 12/10 and 12/12 are my depart and arrival dates.

ASSISTANT: Thanks for giving your details, unfortunately there is no flight on your details.

USER: No worries, thank you for your response.

ASSISTANT: Thank you so much for choosing us. Have a good day.