You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: My name is Jonathan Robinson. The city of Denver maintains a number of parks throughout downtown and surrounding areas and I would like to visit all of them, can you please help me to book a flight to Denver, CO - DEN?

ASSISTANT: Sure, we can help you.

USER: Thank you.

ASSISTANT: Can you please share me your budget for this reservation?

USER: I am willing to spend maximum 1000.

ASSISTANT: Ok, when are you planning to travel?

USER: I will start my travel on 09/04 to 09/06.

ASSISTANT: Ok, may I know your nearest airport code?

USER: I will take off from Philadelphia, PA - PHL.

ASSISTANT: Ok, let me check the availability of flights on your route.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, there are no flights available as per your details.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for reaching us.