You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Susan Roberts, want to travel from DTW to ATL. Please help me in booking my ticket.

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my travelling dates are from 01/01 to 01/03.

ASSISTANT: There is no flight available.

USER: It's ok, thank you.

ASSISTANT: Welcome.