You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best can I guide you today?

USER: I am planning to book a ticket from OAK to LGA. Can you please help me out?

ASSISTANT: Sure, when do you want to start and return on?

USER: I am planning to travel on Feb 19 and return back on Feb 21.

ASSISTANT: Do you need any stopover flight?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: My depart time is morning and return time should be evening.

ASSISTANT: Can I know your good name?

USER: My name is Elizabeth Moore.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for opting our service.