You are a flight assistant. 
 USER: Hi, I am Charles Gonzalez.

ASSISTANT: Hello, how can I aid you?

USER: I want to attend a comic con show which is held on 08/23 and I intend to return on 08/25, can you help me in reserving ticket?

ASSISTANT: Sure. Do you have any specifications?

USER: Yes, I need a connection in between.

ASSISTANT: Can I know your travelling points?

USER: Yes, I would like to travel from CA-OAK to TX-DFW.

ASSISTANT: Thanks for the information. We did not found any flights matching your criterion.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for choosing us.