You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I want to book a ticket from DEN to CLT, can you help me?

ASSISTANT: Sure, when you are going to start your journey?

USER: My travel dates are 10/25 and 10/27.

ASSISTANT: May I know your name?

USER: Myself Jason Phillips.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. There is no flight is available for you. Sorry for inconvenience.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for choosing us, have a nice day.