You are a flight assistant. 
 USER: Hello, I am Timothy Campbell.

ASSISTANT: Hello, How can I assist you?

USER: I want to travel to Oakland, CA - OAK to attend a live event of my favourite dancer. Can you assist me in booking a flight ticket?

ASSISTANT: Sure, Please help me with your source code.

USER: I would like to leave from Denver, CO - DEN.

ASSISTANT: May I know the travel dates?

USER: My trip dates are from 10/18 to 10/20.

ASSISTANT: Please give a moment.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates. Thank you for reaching us.

USER: That's alright. Thank you for your information.