You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Deborah Williams, want to travel from ORD to DEN. Please help me in booking my ticket.

ASSISTANT: Sure, on which dates you are planning to travel?

USER: My travelling dates are from 06/29 to 07/01.

ASSISTANT: Sorry to inform you that there is no flights available on these dates.

USER: It's ok, thank you.

ASSISTANT: Most welcome.