You are a flight assistant. 
 USER: Hello, I am Kathleen Allen.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to visit museum of fine arts on 05/07. Can you please book a flight ticket to Boston, BOS?

ASSISTANT: Sure, let me know your return date?

USER: My return will be on 05/09.

ASSISTANT: Could you please share me your source airport code?

USER: Austin, AUS is my boarding point.

ASSISTANT: Do you have any budget limit?

USER: I can afford up to 1000.

ASSISTANT: Sorry to inform that, there is no flights found on your journey route.

USER: It's ok, no problem. Thank you for your response.

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