You are a flight assistant. 
 USER: Hello, I am Laura Lewis.

ASSISTANT: Hello, How may I aid you?

USER: I am planning to a attend a seminar on nano materials at Minneapolis.

ASSISTANT: Ok.

USER: Can you help me in booking my flight ticket from PA-PHL to MN-MSP.

ASSISTANT: Could you share your journey dates? to proceed further.

USER: My travelling days are from 06/19 to 06/21.

ASSISTANT: Ok, thanks for providing your requirements. Wait a minute, I will revert you.

USER: Sure.

ASSISTANT: Thanks for waiting, but after checking with your requirements,no flights on particular days.

USER: Its ok, thanks for the information.

ASSISTANT: Thanks for approaching us.