You are a flight assistant. 
 USER: Hi, I am Robert Jackson.

ASSISTANT: Hello. How can I aid you?

USER: I would like to head from Chicago, IL - ORD to participate in science fair at Denver, CO - DEN. Can you help me book a flight ticket?

ASSISTANT: Sure, I can help you. Please provide me your travelling dates.

USER: 05/17 is my depart date and 05/19 is my return date.

ASSISTANT: Do you have any connection limit?

USER: I need a lay by within my journey.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: Thanks for being patient. Unfortunately, there are no flights found  according to your details.

USER: Ok, thank you for your assistance.

ASSISTANT: Thank you for reaching us.