You are a flight assistant. 
 USER: Hi, I am Mark Moore.

ASSISTANT: Hello, how may I assist you today?

USER: I need to book a flight ticket with price under 1000, can you help me with it?

ASSISTANT: Sure, please share your airport codes?

USER: Ok, my airport codes are PA-PHL and MA-BOS.

ASSISTANT: May I know your travelling dates?

USER: I have planned to travel on 03/13 and return on 03/15.

ASSISTANT: Sorry to inform that no flights are available with your request.

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

ASSISTANT: Thanks for availing us.