You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you help me to book a flight from EWR to CLT?

ASSISTANT: May I know your trip dates?

USER: My travelling dates are 12/25 and 12/27.

ASSISTANT: Do you have any other requirements?

USER: I need a direct flight.

ASSISTANT: Ok, please wait a minute.

USER: I prefer economy class.

ASSISTANT: May I know your name please?

USER: My name is Frank Scott.

ASSISTANT: Sorry Frank, there is no flights available.

USER: No issues, thank you for your time.

ASSISTANT: Most welcome.