You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I serve you today?

USER: I want to book a ticket from SFO to LAS. Could you book a ticket?

ASSISTANT: Sure, kindly mention your planned travelling dates to proceed further.

USER: Travelling dates are Nov, 12 and Nov, 14.

ASSISTANT: May I know your name please?

USER: My name is Donna Adams.

ASSISTANT: Please let me know your connection preference.

USER: I prefer connecting flight.

ASSISTANT: Is there any other specifications?

USER: I would like to return in the afternoon time.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

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

USER: Thank you.

ASSISTANT: Thank you for availing us.