You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Benjamin Lewis here. Can you please help me in booking a flight ticket from ORD to DFW?

ASSISTANT: Sure, could you please share me with your dates of travel?

USER: Sure, my travel dates are from Aug 23 to Aug 25.

ASSISTANT: Do you have any other specifications?

USER: I need to return in the morning.

ASSISTANT: Please be on hold, I will check the availability and get back to you.

USER: Sure, I will wait for your response.

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

USER: Ok, no issues. Thank you for the information.

ASSISTANT: You are welcome.