You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you?

USER: As I am architecture I heard that in Dallas there is workshop going on in the month of June. So, I am willing to attend it. Can you please assist me to book a flight ticket?

ASSISTANT: Sure, can you please share your preferable dates to travel?

USER: Yes, I want to start my journey on 06/26 and I want to return back to my city on 06/28.

ASSISTANT: May I know your source and destination airport codes please?

USER: Sure, my source airport code is PHL and destination airport code is DFW.

ASSISTANT: May I know your good name please?

USER: Yes, my name is Deborah Adams.

ASSISTANT: Sorry for the inconvenience, there is no flight available on your requested dates.

USER: Not an issue, I will go with another resources to reach out my destination. Anyway thank you for the help.

ASSISTANT: Thank you for approaching us.