You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Please book a ticket from DCA to DFW to go for Music festival.

ASSISTANT: Can you give me your trip dates?

USER: My travelling dates are June 26 and June 28.

ASSISTANT: Do you need any connections?

USER: I want single connected flight.

ASSISTANT: Are there any other preferences?

USER: No.

ASSISTANT: May I know your name?

USER: Sure, I am Melissa Hill.

ASSISTANT: Sorry, there is no flight found with your details.

USER: Ok, no worries. Thank you.

ASSISTANT: Thank you for reaching us.