You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, could you please tell me how may I guide you?

USER: Can you assist me to book flight to PHL from OAK?

ASSISTANT: Sure, I am here to assist you.

USER: Thank you.

ASSISTANT:  Kindly mention your planned travelling dates to proceed further.

USER: My trip dates are Oct 15 and Oct 17.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I prefer a connecting flight.

ASSISTANT: Is there any other preferences that you would like to add before booking?

USER: I prefer a business class to travel.

ASSISTANT: Ok, for further process can I have your name please?

USER: I am Christine Harris.

ASSISTANT: Thank you for providing your journey details, please wait a moment I'll search best flight for you.

USER: Ok.

ASSISTANT: Thank you for being patient, we didn't find any flights which matches your requirement.

USER: Ok, not a problem.

ASSISTANT: Thank you for reaching us, have a good day.

USER: Thank you.