You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to visit the Great Park Street in Washington. Can you help me in booking a ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: I am planning to travel on dates 07/26 and 07/28.

ASSISTANT: Ok, could you provide me your airport codes?

USER: The airport codes are DFW and DCA. Make sure the connections is 0.

ASSISTANT: Sorry, no flight's available on your request.

USER: That's fine. Thank you for your information.

ASSISTANT: May I know your name?

USER: My name is Stephanie Clark.

ASSISTANT: Thank you for contacting us.

USER: Welcome.