You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am planning for vacation with my friend. Can you help me with booking?

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: I will fly on May 22 and return on May 24?

ASSISTANT: May I know your source and destination airport codes please?

USER: My source point is ORD and destination is LAX.

ASSISTANT: Do you need break in between your journey?

USER: No.

ASSISTANT: Please let me know if you have any other specifications.

USER: No, I do not have any other specification.

ASSISTANT: Can I have your good name please?

USER: My name is Rebecca Moore.

ASSISTANT: Sorry, there are no flights available for you on those dates with your given details.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing us.