You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Charles Allen here.

ASSISTANT: Allen, how can I assist you today?

USER: I want to meet my family at Houston, so please book my ticket from LAS to IAH.

ASSISTANT: Can I please know your trip dates?

USER: My trip dates are 04/22 and 04/24.

ASSISTANT: Please wait for a moment.

USER: I need 1 connection.

ASSISTANT: Sorry Allen, no flight is available for you.

USER: No problem, thank you.

ASSISTANT: Most welcome, have a good day.