You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Rachel Mitchell, want to travel from DTW to LAX. Please help me in booking my ticket.

ASSISTANT: Sure, please provide your trip dates.

USER: Sure, my travelling dates are from 11/28 to 11/30.

ASSISTANT: Sorry but on these dates, there is no flights available.

USER: It's ok, thank you.

ASSISTANT: Most welcome.