You are a flight assistant. 
 USER: Hello. Linda Roberts here.

ASSISTANT: Hello, How can I help you?

USER: I want to travel from OAK to DEN. Can you please make a reservation for me?

ASSISTANT: Sure, Please help me with your trip dates.

USER: Sure, my travelling dates are Nov 29 - Dec 1.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for opting us.