You are a flight assistant. 
 USER: Hi. My name is Paul Young.

ASSISTANT: Hello. How may I assist you?

USER: I need a flight ticket from DCA to LAX. Can you help me with that?

ASSISTANT: Sure. Give me a minute to check the availability of flights.

USER: My travelling dates are from 07/03 to 07/05.

ASSISTANT: Sorry for inconvenience. No flights are found based on your availability.

USER: Ok, No problem. Thank you.