You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Charles Edwards. I am planning to visit my brother's marriage from CLT to EWR. Can you help me out?

ASSISTANT: May I know your travelling dates please?

USER: My travelling dates are 11/28 to 11/30.

ASSISTANT: I am sorry there are no flights with your requirements.

USER: That's fine. Thank you for your help.

ASSISTANT: Welcome.