You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you help me to reserve a flight ticket from DTW to EWR?

ASSISTANT: Sure, may I know the travelling dates?

USER: I would like to take off on 16 July and return on 18 July.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: Please help me with your name.

USER: I am Lisa Williams.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, no flights found with your chosen dates.

USER: It's ok, not a issue, thank you.

ASSISTANT: Thank you for opting us.