You are a flight assistant. 
 USER: Hi, I am Rebecca Phillips.

ASSISTANT: Hello, how may I serve you?

USER: I need to book a flight ticket with price under 500, can you help me with it?

ASSISTANT: Sure, may I know your travelling dates?

USER: Yes, my travelling dates are 02/09 and 02/11.

ASSISTANT: Can I know your journey codes?

USER: Yes, my airport codes are WA-SEA and NY-EWR.

ASSISTANT: Unfortunately there are no flights found matching with your requirements.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for reaching us.