You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I have to attend a cultural event at Denver, can you help me to book a flight ticket from OAK to DEN?

ASSISTANT: Sure, we are here to help you. Kindly share your travel dates.

USER: Thank you. My travelling dates are 31 Dec and 02 Jan.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any other specifications?

USER: I would like to depart in the morning.

ASSISTANT: Please share your name.

USER: I am Kimberly Lewis.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thanks for reaching us.