You are a flight assistant. 
 USER: Hi. Jack Phillips here.

ASSISTANT: Hello, how may i guide you?

USER: Can you book a ticket from DEN to LAX?

ASSISTANT: Sure, can I know your preferable dates?

USER: Sure, here are my travel dates 11/28 and 11/30. Please check with 1 connection.

ASSISTANT: I am sorry, there are no flights available. Thank you.

USER: No issues, thank you for the help.