You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Patricia Martin want to attend my sister-in-law's marriage at Philadelphia, can you book a ticket within the fare of 500?

ASSISTANT: Sure, may I know your unique airport codes please?

USER: Yes, I would like to have my journey from LAS to PHL.

ASSISTANT: Ok, may I know your dates of journey please?

USER: Sure, my travelling dates will be 03/06 and 03/08.

ASSISTANT: Ok, hold on for a moment. Let me check.

USER: Ok.

ASSISTANT: I found a flight for you with Hawaiian airline and it costs you 700. Shall I proceed?

USER: Can you please check for flights within 500?

ASSISTANT: Sorry Martin, there are no flights with your price limit.

USER: Ok fine, thank you.

ASSISTANT: Sorry for the inconvenience provided.

USER: That's ok, thanks for the information.

ASSISTANT: Thank you for choosing us. Have a great day.