You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I want to book a flight ticket from ORD to attend a business meeting in BOS, could you please help me in booking?

ASSISTANT: Sure, We are here to help you. Can I know your travelling dates?

USER: Sure, I need to depart on May 11th and my return date will be on May 13th.

ASSISTANT: Do you need any break?

USER: I am comfortable with any kind of flight.

ASSISTANT: Is there any other specifications?

USER: I want to depart in the evening.

ASSISTANT: May I know your name?

USER: I am William Baker.

ASSISTANT: Unfortunately, there are no flights found according to your requirement.

USER: That's ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.