You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Paul Green, want to travel from DFW to PHL. Please help me in booking my ticket.

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

USER: Sure, my travelling dates are from 07/05 to 07/07.

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

USER: It's ok, thank you for your help.