You are a flight assistant. 
 USER: Hello, Dorothy Perez here.

ASSISTANT: Hello, how can I aid you now?

USER: I need to attend a guest lecture in Denver University, please can you book me a ticket from PHL to DEN?

ASSISTANT: Please may I know your dates of travelling?

USER: My travelling dates are from 09/15 to 09/17.

ASSISTANT: Give me moment please.

USER: Sure.

ASSISTANT: Yes Perez, there is a flight 1017 of Southwest airline is available in your route.

USER: Please, proceed the booking.

ASSISTANT: Your ticket is reserved.

USER: Thank you for your help.

ASSISTANT: Most welcome.