You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I need a direct flight for my journey to New York in April month. Can you assist me in booking my flight ticket?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Sure, my travelling dates are Apr 11 and Apr 13.

ASSISTANT: Please provide your airport codes.

USER: Sure, my airport codes are CLT and EWR.

ASSISTANT: Do you have any preferences about class?

USER: No.

ASSISTANT: Please mention your name.

USER: Ok, my name is William Hill.

ASSISTANT: There are no flights found under your preferable details.

USER: Not an issue with that, anyways thank you for the information.

ASSISTANT: Welcome, have a great day.