You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me to book flight ticket from OAK to PHL?

ASSISTANT: May I know your travel dates?

USER: My trip dates are July 16 and July 18.

ASSISTANT: Do you have any connection limit preferences?

USER: I prefer a connecting flight.

ASSISTANT: Is there any concern with other specifications?

USER: I would like to travel in economy class.

ASSISTANT: No flights found as per your preferences.

USER: It's ok.

ASSISTANT: May I know your name please?

USER: I am Raymond Walker.

ASSISTANT: Thank you for choosing us.

USER: Thank you.