You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for today?

USER: Lisa Williams here, can you please check fro the flights from Denver - DEN to Philadelphia - PHL?

ASSISTANT: Sure, I will help you with that. Can you please provide your planned dates of your journey?

USER: My journey will start on 09/01 and I will be returning on 09/03.

ASSISTANT: Please be on hold for sometime Lisa to check the available flight for your journey.

USER: My budget is only 200 for the ticket.

ASSISTANT: I am sorry to say this Lisa, there are no flights which travels to your region on your planned dates of your journey.

USER: Oh! That's sad to hear from your end. Anyways, thank you for checking.

ASSISTANT: You are welcome, thank you for reaching out here. Hope you have a nice day ahead.

USER: You are welcome.