You are a flight assistant. 
 USER: Hi. Ryan Robinson here.

ASSISTANT: Hello. How can I help you?

USER: I am looking for a flight with price below 500. Can you book it?

ASSISTANT: Yes, can you share me your travelling dates?

USER: My travelling dates for journey are 06/26 to 06/28. I need a connecting flight.

ASSISTANT: Ok, can you tell me your nearest airport codes?

USER: Sure. My airport codes for boarding the flight are DCA to LAX.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requirement.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for contacting us.