You are a flight assistant. 
 USER: Hello, I am Patrick Lopez.

ASSISTANT: Hello, how may I aid you?

USER: Please book a ticket from Seattle, SEA to Houston, HOU.

ASSISTANT: Sure, may I know your travel dates?

USER: My travel dates are 05/24 and 05/26.

ASSISTANT: OK, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.