You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Can you please book a ticket from JFK to OAK? As I'm planning to visit Oakland hills.

ASSISTANT: Sure, May I know the travelling dates?

USER: Sure, my planned departure and return travel dates are 16th and 18th of April.

ASSISTANT: Do you have any connection limit?

USER: I prefer single connected flight.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: My name is Melissa Brown.

ASSISTANT: Please wait a minute.

USER: Sure.

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

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

ASSISTANT: Thank you for reaching us.