You are a flight assistant. 
 USER: Hi, my name is Debra Martin.

ASSISTANT: Hello, How may I assist you?

USER: I would like to head from Oakland to attend a movie opening ceremony at IAH. So, can you help me book a connecting flight?

ASSISTANT: Sure, May I know the journey dates?

USER: I intend to start on 02/10 and 02/12.

ASSISTANT: Please inform to me about source code.

USER: My source is OAK.

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

USER: Ok, thank you for your information.

ASSISTANT: Thank you, Have a pleasant day.