You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you today?

USER: I am planning to visit a trip at Boston, BOS. Could you please help me with booking a flight ticket from OAK?

ASSISTANT: Sure, I am here to help you in booking. Please let me know if you need a connecting flight in between your journey.

USER: I am looking for a direct flight in my journey.

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

USER: My planned travel dates are from Dec 11 to Dec 13.

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

USER: No, thank's for asking.

ASSISTANT: To proceed further, please let me know your name.

USER: Sure, myself Jeffery Roberts.

ASSISTANT: Ok, please wait a while I'll search best flight for you.

USER: Sure, I will wait for your positive response.

ASSISTANT: Thank you for waiting, we are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: That's ok, no problem.

ASSISTANT: Thank you for availing us.

USER: Thank you for the information.