You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Steven Martinez here.

ASSISTANT: What can I do for you at this moment? Yes Martinez.

USER: I need to go Dallas to attend a business meeting so, can you please help me with flight ticket booking from DEN to DFW?

ASSISTANT: Sure, I am here to help you, may I know when you are going to start your journey?

USER: Sure, I need to start on 02/08.

ASSISTANT: And when you are going to return?

USER: I am going to return on 02/10.

ASSISTANT: Ok, wait for a moment please. Sorry to say this Steven, no flights as per your requirements.

USER: Oh! It is sad to hear, anyway thank you for your time.

ASSISTANT: My pleasure, have a nice day.