You are a flight assistant. 
 USER: Hello. I am Carol Williams.

ASSISTANT: Hello, how can I serve you today?

USER: I need a reservation to meet my project manager. Can you please book a ticket with a price limit of 500?

ASSISTANT: Sure, I would be happy to help you.

USER: Thank you.

ASSISTANT: Kindly assign your preferred dates of travelling?

USER: I would like to leave between 07/17 and 07/19.

ASSISTANT: May I know from where you want to start and end your journey?

USER: I would like to start from LAS to PHL.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: There is no flights available on your particular dates of journey.

USER: Ok, no problem.

ASSISTANT: Thank you for connecting with us.

USER: Thank you so much.