You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I am Emily Clark. I want to celebrate Valentines day with my valentine at Oakland, OAK. Can you help me in booking on 02/14?

ASSISTANT: Sure, May I know the source code?

USER: I am boarding at Charlotte, CLT.

ASSISTANT: Please help me with your return date.

USER: I will be return on 02/16.

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

USER: Ok, No problem. Thank you.

ASSISTANT: Thank you for availing us.