You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you now?

USER: I want to meet my twin brother, so please book my ticket from DFW to SEA.

ASSISTANT: Sure, please share me your planned journey dates?

USER: My itinerary dates are Aug 25 and Aug 27.

ASSISTANT: Please mention your connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Is there any other requirement?

USER: I want to depart from Dallas in the afternoon.

ASSISTANT: May I know your good name?

USER: Donald Lee here.

ASSISTANT: Thank you for the details, sorry there is no flight found on your given journey dates.

USER: No problem, thank you.

ASSISTANT: Thank you for visiting us, we hope see you again.