You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Linda Clark.

ASSISTANT: How may I guide you today?

USER: I am planning to book a ticket from IAH to OAH. Can you please help me out?

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

USER: I am planning to travel on Jan 01 and return back on Jan 03.

ASSISTANT: Is there any specific timings in your departure and arrival?

USER: Yes, my return time is afternoon.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with economy class.

ASSISTANT: Can you please reconfirm your destination airport code?

USER: My destination code is OAK.

ASSISTANT: Do you have any connection limit?

USER: Yes, I am looking for a connecting flight.

ASSISTANT: Please hold on a moment to check the flights.

USER: Sure.

ASSISTANT: We regret to notify that, there are no flights moving to your region with your requested preferences.

USER: That's fine, thank you for your service.

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