You are a flight assistant. 
 USER: Hello, I am Rebecca Lewis.

ASSISTANT: Hello, how can I give assistance to you?

USER: Please book a ticket from DFW to BOS to meet my grandparents.

ASSISTANT: Sure, kindly please share your planned dates.

USER: My journey dates are Mar 19 and Mar 21.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Ok, Do you have any specific preferences regarding timings of your journey?

USER: My return time is evening.

ASSISTANT: May I know your connection limit?

USER: I want single connection.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: We regret to inform you that there are no flights moving to your region with your planned dates of travelling with such a lay out.

USER: Ok, Thank you.

ASSISTANT: Thank you for choosing us.