You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I would like to book a flight which departs in the afternoon. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, We are here to help you out. May I know your take off and landing points?

USER: I want to board from ORD to OAK.

ASSISTANT: Could you please share your departure and arrival dates?

USER: My travelling dates are July 23 and July 25.

ASSISTANT: Please let me know your connection limit.

USER: I prefer a break in between the journey.

ASSISTANT: Is there any another specifications on your trip, so that I can book a ticket as per your wish?

USER: No, I do not have any other preferences.

ASSISTANT: Please be on hold for sometime, as I can check a flight for your journey with the best airlines.

USER: Sure.

ASSISTANT: May I know your name?

USER: I am Andrew Mitchell.

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

USER: No worries, thank you for the information.

ASSISTANT: Thank you for reaching us.