You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Patricia Green. I want to attend my son graduation in  Dallas. Can you please  book me a ticket?

ASSISTANT: Sure, Can you please provide your journey details?

USER: I will start from Boston,MA-BOS on 02/06. I will depart to TX-DFW on 02/08.

ASSISTANT: Ok, Please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for your patience, There is no flight found with your given details.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing us.