You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Gregory White here.

ASSISTANT: How may I help you?

USER: Please help me out in booking the ticket from DEN to CLT.

ASSISTANT: May I know your preferable travel dates?

USER: My trip dates will be July 12 to July 14.

ASSISTANT: Please be on hold for a while.

USER: Ok.

ASSISTANT: Thank you for being on hold, there is no flight found on your journey dates to book the ticket.

USER: That's ok, thank you.

ASSISTANT: You are most welcome.