You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I be of your service?

USER: Can you please book a flight ticket from BOS to OAK?

ASSISTANT: Sure, we are glad to help you in booking. Could you please let me know your planned travelling dates?

USER: I need to travel in the month of May from 4th to 6th.

ASSISTANT: Do you need a flag stop in between your journey?

USER: Yes, I would need a flag stop in my journey.

ASSISTANT: Kindly share if you have any class preference.

USER: I don't have any class preference.

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

USER: Yes, please make sure that my return time is in morning.

ASSISTANT: May I know your name please?

USER: Sandra Gonzalez here.

ASSISTANT: Thank you for providing your journey details, please wait a moment.

USER: Sure, take your time.

ASSISTANT: We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for approaching us.