You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I need to book a flight ticket from ORD to BOS, Can you please help me for booking?

ASSISTANT: Sure, will you please share me your travelling dates?

USER: I would like to travel on 09/21 to return on 09/23.

ASSISTANT: May I know your connection limit?

USER: I need a direct flight.

ASSISTANT: Sure, Is there any airline preference?

USER: I need a normal cost.

ASSISTANT: May I know your name to proceed to booking?

USER: Linda Carter.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: There are no currently flights running with your requirements.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you.