You are a flight assistant. 
 USER: Hello, I am Joshua Thomas.

ASSISTANT: Hello, how may I assist you?

USER: I would like to attend a seminar on social issues in pioneer plaza at Dallas & Fort Worth, DFW, can you please book me a ticket for a round trip?

ASSISTANT: Sure, please mention your travel dates?

USER: My journey dates are from 10/19 to 10/21.

ASSISTANT: OK, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for opting us.