You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My name is David Perez.

ASSISTANT: Ok.

USER: I would like to visit Los Angeles for my cousin's marriage, can you please help me in booking a ticket?

ASSISTANT: Yes, can I know the dates of travel?

USER: The dates are 01/13 and 01/15.

ASSISTANT: Can I know the airport codes?

USER: The airport codes are ORD and LAX. Please make sure that connection should be 0.

ASSISTANT: I'm sorry David, there are no flights matching your requirements.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you, have a good day.