You are a flight assistant. 
 USER: Hello, I am Kevin Allen.

ASSISTANT: Hello, How can I do for you?

USER: I want to book a flight ticket to Philadelphia to visit some historical places. Please help me with a connecting flight.

ASSISTANT: Sure, May I know the journey codes?

USER: My journey codes are from OAK to PHL.

ASSISTANT: Please help me with your travel dates.

USER: My travelling dates are from 12/01 to 12/03.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for opting us.