You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you please book a flight ticket form JFK to PHL?

ASSISTANT: Sure, could you please help me with your travelling dates?

USER: My travelling dates are July 02 and July 04.

ASSISTANT: Do you have any other preferences?

USER: I need a ticket under normal cost.So please check for the United airlines.

ASSISTANT: Sure, may I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: May I know your name?

USER:     My name is Sharon Wright.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

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

ASSISTANT: Thank you for choosing us.