You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you?

USER: Please book a ticket from Chicago to Boston.

ASSISTANT: Sure, may I know your depart and return dates?

USER: I will start journey on 05/06 and will return by 05/08.

ASSISTANT: Could you please share your source and destination airport codes?

USER: Airport codes are ORD and BOS.

ASSISTANT: Do you need halt in between your journey?

USER: I need a halt in between journey.

ASSISTANT: May I know your name please?

USER: I am Pamela Walker.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Thanks for the assistance.

ASSISTANT: Thank you for opting us.