You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: This is Benjamin King, can you help me to book a flight ticket from DEN to DFW?

ASSISTANT: Sure, may I know your dates of journey please?

USER: I am travelling from June 2 to June 4.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry King, there is no flight found as per your travelling details.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: You are welcome.