You are a flight assistant. 
 USER: Hi, I am Justin Allen.

ASSISTANT: Hello Justin, how may I help you.

USER: I want to head to Dallas & Fort Wroth on 01/14 from PA-PHl to attend US open. My return would be on 01/06, can you book a flight ticket for me?

ASSISTANT: Ok, could you please provide your destination code?

USER: My destination airport is TX-DFW.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, no flights found on your dates.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for approaching us. Have a nice day!.