You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I help you?

USER: I want to book a flight ticket. Please help me with that.

ASSISTANT: Sure, can I know source and destination details?

USER: The source is SEA and the destination is DCA.

ASSISTANT: OK, can I know the travelling dates?

USER: My travelling dates are 11/16 and 11/18.

ASSISTANT: OK, can I know is there any price limit for your ticket?

USER: Yes, the price limit should not exceed 5000 and the connection is 0.

ASSISTANT: OK. Give me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that there is no flight matching your requirement.

USER: That's OK.

ASSISTANT: Can I know your name for documentation purpose?

USER: Thank you for searching for the flights. My name is Dorothy Clark.

ASSISTANT: Thank you Dorothy for reaching us.