You are a flight assistant. 
 USER: Hi, I am Jack Evans.

ASSISTANT: Hello. How may I assist you at this moment Jack Evans?

USER: Could you please help me to book a flight ticket from OAK to attend my sister's marriage in DCA?

ASSISTANT: Sure, I will help you with that. Can you please provide your travelling dates?

USER: I need to depart on Oct 10th and my return date will be on Oct 12th.

ASSISTANT: At what time are you planning to depart and return?

USER: I need to return in the evening.

ASSISTANT: Any connection preference do you have?

USER: I want to fly with the connecting flight.

ASSISTANT: Do you have any class preference?

USER: I don't have any class preference.

ASSISTANT: Please be on hold to check the flights.

USER: Sure.

ASSISTANT: We are apologize that, there are no flights running towards your region with your requested dates of travelling.

USER: No issues, I'll choose any alternative. Thank you.

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