You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Matthew Clark here. I need to attend a seminar regarding Hacking Trends in Dallas. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you out. May I know your travelling dates please?

USER: My departure date is 03/15 and return date is 03/17.

ASSISTANT: Ok, please wait for a while.

USER: My airport codes are from CLT to DFW. Ok, I will wait.

ASSISTANT: Wait for a while. Sorry, there are no flights found.

USER: So sad for that. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.