You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you aid me to book a flight ticket from DEN to PHX?

ASSISTANT: Sure, to book a ticket can I know your journey dates?

USER: I planned my trip on the dates June 16 and June 18.

ASSISTANT: Do you have any other requirements?

USER: I am looking for a connecting flight.

ASSISTANT: Let me know your name.

USER: Myself Deborah Allen.

ASSISTANT: We are sorry to inform you that there is no flight available with your given information.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thank you.