You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Michael Davis, I am planning to attend my brother's marriage in Chicago, can you help me for booking a flight ticket from EWR to ORD?

ASSISTANT: Sure, can I know the travel dates please?

USER: My travelling dates are 07/05 and 07/07.

ASSISTANT: Ok, wait a moment please.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say that, there are no flights available as per your request.

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

ASSISTANT: Thank you for approaching us.

USER: Welcome.