You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Timothy Wilson here.

ASSISTANT: How can I assist you?

USER: Can you help me to find a flight from PHL to EWR?

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

USER: My travelling dates are 08/18 and 08/20.

ASSISTANT: Do you have any requirements?

USER: My departure time must be evening.

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

USER: That's fine, thanks for your information.

ASSISTANT: Thank you for approaching us.