You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am planning to visit Millennium Park at Chicago, could you please help me with booking a flight ticket from PHL to ORD?

ASSISTANT: Sure, may I know your trip dates please?

USER: I would like to depart on June 17th and return on June 19th.

ASSISTANT: Do you have any other requirements?

USER: I am looking for a connecting flight.

ASSISTANT: Can I know your name please?

USER: I am Christine Green.

ASSISTANT: Please wait.

USER: Sure, take your time.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Most welcome.