You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Alexander Lee here. I am planning to book my ticket from ORD to HOU. Can you please help me with booking?

ASSISTANT: Your travelling dates please?

USER: My travel dates are Aug 19 and Aug 21.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight in my journey and my depart time is Evening and return time is Afternoon.

ASSISTANT: I am sorry no flights found your route.

USER: Not a problem, anyway thank you for the information.

ASSISTANT: Thank you for choosing us.