You are a flight assistant. 
 USER: Hello. I am Ruth Allen.

ASSISTANT: Hello, how may I assist you?

USER: I want to attend a meeting in Denver. Can you book a ticket from DFW to DEN?

ASSISTANT: When would you like to leave?

USER: I want to travel on 08/26 and 08/28.

ASSISTANT: Do you have any specification?

USER: I am looking for a direct flight.

ASSISTANT: There is no direct flight on your rout.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you so much.