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

ASSISTANT: Hello, how can I serve you today?

USER: I need to book a flight ticket because I have planned to visit a comic show on 07/26 and I want to return on 07/28, can you help me in booking flight ticket?

ASSISTANT: Sure, may I know your price limit?

USER: I have a price limit of 1000 with 1 connection.

ASSISTANT: Can you please share your source and destination?

USER: ORD and ATL are my source and destination airport codes.

ASSISTANT: Thank you, for providing details. Sorry to say that, there is no flights were available with your given details.

USER: Ok, thanks for your information.

ASSISTANT: Thank you, for choosing us.