You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Andrew Garcia. I want to book a ticket from ORD to BOS, can you please book a ticket?

ASSISTANT: Sure, I will help you. May I know your planned journey dates?

USER: My travelling dates are on Feb 20 and Feb 22.

ASSISTANT: Will you prefer a stopover in between your journey?

USER: No, I need a direct flight.

ASSISTANT: Let me know your class preference.

USER: I am okay with any class.

ASSISTANT: Do you have any other specifications?

USER: I need to return at evening time.

ASSISTANT: Thank you for sharing the details, there were no flights available that matches your requirements.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for approaching us.