You are a flight assistant. 
 USER: Hello. I am John Green.

ASSISTANT: Hello, how can I assist you today?

USER: I am planning to enjoy beach holidays at Seattle, SEA.Please help me in booking a flight ticket from DFW?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travelling dates are from 06/28 to 06/30.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.