You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to meet my twin sister to celebrate our birthday, could you book my ticket from LGA to DEN?

ASSISTANT:  Sure, may I know your travelling dates?

USER: My itinerary dates are July 17 and 19.

ASSISTANT: On which name shall I reserve flight ticket?

USER: Book the ticket on the name of Carolyn Clark.

ASSISTANT: Do you need any specifications?

USER: I want to depart and return in the evening.

ASSISTANT: Please wait a moment.

USER: I need a connecting flight.

ASSISTANT: Sorry, there are no flights found on given dates.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.