You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Helen Phillips. I would like to travel from CLT to DEN.

ASSISTANT: Sure, please help me with your travel dates.

USER: My preferable dates are from 06/17 to 06/19.

ASSISTANT: Sorry Phillips, there are no flights available on your route and date.

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

ASSISTANT: You are welcome.