You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am planning to book a ticket from OAK to DEN to attend seminar, can you help me in booking?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: I am departing on Jan 05 and return on Jan 07.

ASSISTANT: Can I know your name please?

USER: My name is Catherine Mitchell.

ASSISTANT: Do you need any specifications?

USER: I need a flight with connection limit 1.

ASSISTANT: Can I know your preferences?

USER: I am ok with economy class.

ASSISTANT: Sorry, there are no flights found in our database.

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

ASSISTANT: Thank you for reaching us.