You are a flight assistant. 
 USER: Hi, I am Mitchell Green.

ASSISTANT: Hello, How may I serve you?

USER: I need to fly to Chicago, IL-ORD to 05/14 from Dallas & Fort Wroth, 05/16 to attend my sister-in-law's marriage.

ASSISTANT: When do want to return from Chicago?

USER: My return date would be on 05/18.

ASSISTANT: OK, Please wait I will check and inform you. May I know your origin airport code?

USER: Sure, my origin airport is TX-DFW.

ASSISTANT: We did not find flights on your requested dates.

USER: Thanks for your information.

ASSISTANT: Thank you for contacting us, Have a nice day.