You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Jennifer Smith. I have to attend my sister's wedding at Chicago, could you please help me with booking a flight ticket?

ASSISTANT: Can I know your travel dates?

USER: I would like to take off on 05/18 and return on 05/20. My nearest source airport code is JFK and destination airport code is ORD.

ASSISTANT: Can I know your airport codes? Please wait.

USER: Sure, take your time.

ASSISTANT: Sorry Smith, there is no flight available on your requested dates.

USER: That's ok, not an issue. Anyways, thank you for the information.

ASSISTANT: You are welcome.