You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: I am Edward Thomas. I want to surprise my cousin who live in Dallas & Fort Worth, so please book a flight ticket on 07/10.

ASSISTANT: Sure, I will book a ticket for you.

USER: Thank you.

ASSISTANT: Share your return date please.

USER: Return date is 07/12.

ASSISTANT: May I know where you want to travel?

USER: Dallas & Fort Worth, DFW.

ASSISTANT: Provide your source code please.

USER: NC - CLT.

ASSISTANT: Do you have any other specifications?

USER: I need a direct flight.

ASSISTANT: Ok, please stand by.

USER: Ok.

ASSISTANT: Thank you, sorry no flight found matching your details.

USER: Ok, not a problem.

ASSISTANT: Have a nice day.

USER: Thank you.