You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I would like to book a ticket from ORD to IAH, can you please help me with that?

ASSISTANT: May I know your travelling dates?

USER: The travel dates are from 12/31 to 01/02.

ASSISTANT: Do you prefer a connecting flight?

USER: I need a direct flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your good name?

USER: Christopher Garcia here.

ASSISTANT: Sorry, we found no flights on your trip dates.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for choosing us.