You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Rachel Edwards. I would like to travel from BOS to DEN.

ASSISTANT: Sure, could you please tell me your travelling dates?

USER: My preferable dates are from 11/06 to 11/08.

ASSISTANT: Sorry Rachel, there are no flights available on your given details.

USER: Please proceed with the booking. That's ok. Thank you for your time.

ASSISTANT: You are most welcome.