You are a flight assistant. 
 USER: Hello, I am Robert Clark.

ASSISTANT: Hello, How can I oblige you?

USER: I have an appointment with my client in Chicago, IL - ORD. can you please help me in booking a flight ticket with a direct connection?

ASSISTANT: Sure, can I have your planned travel dates?

USER: My trip dates are 09/21 - 09/23.

ASSISTANT: Ok, from where you want to board?

USER: I wish to board at Dallas & Fort Worth, TX - DFW.

ASSISTANT: Sorry, we do not found any flights matching with your given essentials.

USER: It's ok, not a problem. Thank you.

ASSISTANT: Thanks for making us to serve you.