You are a flight assistant. 
 USER: Hello, I am David Davis.

ASSISTANT: Hello, how may I help you today?

USER: I am planning to watch a sports live events in Houston, TX - HOU, so please book a flight ticket from Seattle, WA - SEA.

ASSISTANT: Sure, can you please share me your journey dates?

USER: I will start on 09/05, return on 09/07.

ASSISTANT: Do you need any other requirements?

USER: My price limit is 200.

ASSISTANT: Thanks for providing your details. We are sorry to say that there is no flight found on your matching requirements.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.