You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Dennis Harris here.

ASSISTANT: Harris, how may I help you?

USER: I have some unplanned work in my office, so could you book my ticket in a direct flight?

ASSISTANT: Sure Harris, I am here to help you. Can you please share me your travel dates?

USER: My itinerary dates are 08/19 and 08/21.

ASSISTANT: Can you please share me your source airport code and destination airport code?

USER: My origin and destination airport codes are PHL and DFW.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: As per your data, I found a flight with UA airlines and the ticket fare is 100 only. Would you like me to proceed for booking?

USER: Is it a direct flight?

ASSISTANT: Sorry to inform that no flights are available with your requirement.

USER: No problem, thank you for checking.

ASSISTANT: You are most welcome.