You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Stephanie Collins here.

ASSISTANT: How may I assist you today?

USER: I want to meet my niece on her birthday, could you book my ticket from IAH to EWR?

ASSISTANT: May I know your travelling dates, please?

USER: My itinerary dates are Mar 31 and Apr 2.

ASSISTANT: Do you need any specification?

USER: I want to return 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 on your journey dates.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching our service.