You are a flight assistant. 
 USER: Hello, myself Dorothy Evans.

ASSISTANT: Hello. How may I help you today?

USER: I have to meet my boss on his birthday, could you please help me to book my flight ticket from DEN to DFW?

ASSISTANT: Sure, I am here to help you with that. Can I know your planned trip dates?

USER: Sure, I have to depart on 06/15 and return on 06/18.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flight's as per your request dates.

USER: Not an issue. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.