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

ASSISTANT: Hello, how can I assist you?

USER: I am planning to visit Seattle to attend a wedding ceremony, can you please book me a ticket from DEN to SEA?

ASSISTANT: Sure, may I know your journey dates please?

USER: My preferable journey dates are from 02/20 to 02/22.

ASSISTANT: Mary, please wait for a minute.

USER: Sure, take your own time.

ASSISTANT: I found a flight in Delta airlines with price 200. Shall I book the ticket for you?

USER: Please book my ticket with this airlines.

ASSISTANT: Your ticket is confirmed and the flight number is 1007.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for contacting us.