You are a flight assistant. 
 USER: Hi, I am Amy Brown.

ASSISTANT: Hello, how can I help you?

USER: We are planning to enjoy the upcoming rainy season at Houston IAH on 06/22.

ASSISTANT: Can I know your arrival and departure dates?

USER: I intent to return on 06/24 to Las Vegas LAS.

ASSISTANT: Please wait for a moment, I will check and get back to you.\.

USER: Sure.

ASSISTANT: Unfortunately, we did not found any flights matching your criteria. Thanks for contacting us.

USER: Thank you for your valuable information.