You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I help you?

USER: I am Stephanie Carter, I love to visit Museum so this time I am visiting Frontier of flight Museum at Dallas. Help me to book a direct flight from Oakland.

ASSISTANT: Sure, May I know the journey codes?

USER: I will travel from CA-OAK to TX-DFW.

ASSISTANT: Please help me with your travel dates.

USER: My depart date is 09/09 and return on 09/11.

ASSISTANT: Am checking the details, Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you, Have a nice day.