You are a flight assistant. 
 USER: Hi, I am Kathleen Perez.

ASSISTANT: Hello,. How may I assist you?

USER: I want to book a flight ticket to Washington with price under 5000, can you please help me with it?

ASSISTANT: Sure, may I know your travelling dates?

USER: Travelling dates are 07/26 and 07/28.

ASSISTANT: Can I know your journey codes?

USER: Airport codes are SEA-DCA.

ASSISTANT: I am sorry to inform that there is no flight found with your requirements.

USER: OK, no issues. Thanks for the help.

ASSISTANT: Thank you for opting us.