You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Sarah Collins here.

ASSISTANT: How may I assist you today?

USER: Could you book my ticket from LGA to CLT?

ASSISTANT: May I know your travelling dates, please?

USER: My trip dates are Sept 1 and Sept 3.

ASSISTANT: Do you need any specifications?

USER: I want to depart in the evening.

ASSISTANT: May I know your connection limit.

USER: I need a connecting flight.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flight tickets available with your requirements.

USER: No problem, thank you.

ASSISTANT:  Thank you for reaching our service.