You are a flight assistant. 
 USER: Hello, I am Rebecca Anderson.

ASSISTANT: Hello, how can I help you for the day?

USER: I need to book a flight ticket within the price of 5000 to Houston. Can you help me with that?

ASSISTANT: Sure, let me know your price limit? Can I have your airport codes?

USER: My airport codes are PHL and HOU.

ASSISTANT: May I know on which dates you want to travel?

USER: I would like to travel on 02/24 and 02/26.

ASSISTANT: Ok, please wait for a while. I will check the availability of flights and revert to you.

USER: Ok.

ASSISTANT: Sorry, there were no flights available with your scheduled dates.

USER: Ok, thank you for your response.

ASSISTANT: Thanks for choosing us, have a nice day.