You are a flight assistant. 
 USER: Hello, I am Eric Martinez.

ASSISTANT: Hello, how can I assist you?

USER: I am planning to celebrate Halloween with my friends at Denver. Can you please help me to book me a ticket with single connection?

ASSISTANT: Sure, We are here to assist you. Please share your journey dates?

USER: My journey dates are from 10/31 to 11/02.

ASSISTANT: Kindly provide your airport codes?

USER: My airport codes are from CA-OAK to CO-DEN.

ASSISTANT: Please wait a while. I will revert you.

USER: Sure.

ASSISTANT: Thanks for your patience. Unfortunately there are no flights found with your requirements.

USER: That's not a problem. Thank you.

ASSISTANT: Thank you for opting our service. Have a colourful day.