You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am William Miller.

ASSISTANT: How can I help you?

USER: I want to book a ticket from my home town HOU to meet my cousin who is in MSP?

ASSISTANT: Sure, can you help me with your dates?

USER: My traveling dates are 12/21 to 12/23.

ASSISTANT: Wait a moment please. Sorry to say, there is no flight available on your specified dates.

USER: It's ok. Thank you for your information.

ASSISTANT: Thank you for reaching us.