You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you please book a flight ticket from PHL to ORD?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: My travelling dates are 18 and 20 of Sept.

ASSISTANT: Do you have any other preferences?

USER: I need a direct flight.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: That's ok, thank you for the response.

ASSISTANT: Can I know your name?

USER: My name is Michael Robinson.

ASSISTANT: Thank you for reaching us.