You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ryan Evans.

ASSISTANT: How can I help you?

USER: I am planning to visit ORD to meet my father, can you please find a flight from HOU?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: My travelling dates are 11/22 and 11/24.

ASSISTANT: Please give me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, no problem. Anyway thank you for your information.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.