You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Jonathan Lewis. I am planning to attend music concert at ORD, can you please help me with booking a flight ticket from PHL?

ASSISTANT: Sure, May I know your travelling dates?

USER: Sure, I would like to take off on Mar 20 and return on Mar 22.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a direct flight.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: I would like to return during afternoon time.

ASSISTANT: Thanks for your details, there are no flights found on your data.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you.