You are a flight assistant. 
 USER: Hi. I am Mary Lopez.

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

USER: Can you please book a ticket to Austin, AUS?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can you help me with your source code?

USER: Washington, DCA is the source point to attend the wedding of my cousins.

ASSISTANT: When you are willing to travel?

USER: I am willing to travel on 07/18. I intend to return on 07/20.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need a connecting flight. 200 price limit.

ASSISTANT: Sorry, we found no flights with your price limit.

USER: Ok, thank you.

ASSISTANT: Thank you for choosing us.