You are a flight assistant. 
 USER: Hi, David Carter here.

ASSISTANT: Hello, how can I help you?

USER: I need a reservation to celebrate party with my friend. Can you please book a ticket with a price range of 5000? I need one connection in between my journey.

ASSISTANT: Sure, can you please share your journey dates?

USER: I want to depart on 11/21 and return on 11/23.

ASSISTANT: May I know your airport codes please?

USER: I would like to start from Austin, TX - AUS and return from New York, NY - LGA.

ASSISTANT: Please wait for a while, I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry, we have not found any flights according to your given details.

USER: No issue. Thank you for your support.

ASSISTANT: Thanks for choosing us.