You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to book the flight ticket from ORD to LAS. Can you please help me?

ASSISTANT: Sure, help me with the trip dates?

USER: My travel dates are Jan 17 and Jan 19.

ASSISTANT: May I know your name please?

USER: Benjamin Walker.

ASSISTANT: Do you have any preferences for this trip?

USER: I would like to depart in the morning.

ASSISTANT: Sorry, no flights were available at this moment.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.