You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Dorothy Hill. I would like to book a flight ticket from OAK to DEN to meet my friends. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: Sure, my travelling dates are Aug 12 and Aug 14.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Ok, may I know your arrival time and departure time?

USER: Sure, I want to depart in the evening.

ASSISTANT: Sorry, no flights are available on your route.

USER: No worries, thank you for the information.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.