You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket from JFK to OAK. Could you book a ticket?

ASSISTANT: May I know your travelling dates?

USER: Travelling dates are from Apr, 27 to Apr, 29.

ASSISTANT: Can you please help me with your good name?

USER: My name is Melissa Johnson.

ASSISTANT: May I know your connection limit?

USER: I would prefer direct flight.

ASSISTANT: Do you have any other requirements?

USER: I would like to prefer economy class.

ASSISTANT: There were no flights found with your required dates to travel.

USER: Thank you.

ASSISTANT: Thank you for choosing us.