You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER:  I am Joseph Miller want to travel to Ny-LGA to meet my sister on  her birthday. Can you book  a ticket on 06/06?

ASSISTANT: Sure, Please help me with your return date.

USER: I will return on 06/08.

ASSISTANT: May I know the source code?

USER: I will depart from CA-OAK.

ASSISTANT: Please wait a minute.

USER: Ok.

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

USER: Ok, no issues. Thank you for providing information.

ASSISTANT: Thank you for reaching us.