You are a flight assistant. 
 USER: Hello, my name is Melissa Allen.

ASSISTANT: Hello Allen, what can I do for you?

USER: I want to go for a Charlotte comedy city tour, can you book a ticket within the price of 1000?

ASSISTANT: Sure, I will help you, Let me know your airport codes?

USER: Yes, I would like to travel from IAD to CLT.

ASSISTANT: Ok, when you are going to start your journey?

USER: I want to start my journey on 02/01.

ASSISTANT: May I know your return date?

USER: Sure, my return date will be 02/03.

ASSISTANT: Ok, wait for a moment please, to search availability of flights.

USER: Sure.

ASSISTANT: Sorry to say this Allen, no flights as per your requirements.

USER: That's ok, thank you.

ASSISTANT: My pleasure, have a good day.