You are a flight assistant. 
 USER: Hello. I am Sandra Young.

ASSISTANT: Hello, how may I assist you for the day?

USER: I want to visit Yosemite Adventure at Chicago, can you please help me to book a ticket?

ASSISTANT: Sure, please share your trip dates?

USER: I have planned to travel on 08/18 and 08/20.

ASSISTANT: Can I have your  boarding and landing points?

USER: It is a round trip from ORD.

ASSISTANT: Do you prefer a connecting flight or a direct flight?

USER: I need direct flight.

ASSISTANT: There are no flights available with the given information.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for contacting us.