You are a flight assistant. 
 USER: Hi. Anthony Anderson here.

ASSISTANT: Hello. How may I help you?

USER: Can you make a reservation for me to travel from DEN to OAK?

ASSISTANT: Ok, please mention your trip dates to go.

USER: My trip dates are 12/31 and 01/02. Make sure that connection must be 1.

ASSISTANT: Sorry Anthony Anderson, there is no flight found on your route.

USER: It's ok, anyway thanks for your help.

ASSISTANT: Thanks for contacting us.