You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

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  on which dates you are willing to travel?

USER: I would like to depart on Dec 16th and return on Dec 18th.

ASSISTANT: May I know your class preference?

USER: I am comfortable with any class.

ASSISTANT: Would you like to take break in between your journey?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any specific time preference for journey?

USER: I have no other preferences.

ASSISTANT: For further proceeding, may I know your good name?

USER: I am Eric Williams.

ASSISTANT: Sorry to inform you that, there is no flight found as per your travelling details.

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

ASSISTANT: Thank you for reaching us.