You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Please book me a flight ticket from IAD to LAS to meet my family.

ASSISTANT: May I know your desired travel dates please?

USER: I have planned to travel on June 30th and return on June 02nd.

ASSISTANT: Do you have any specifications?

USER: I prefer connecting flight.

ASSISTANT: Please check your return date.

USER: I will return fly on July 02nd.

ASSISTANT: May I know your name please?

USER: Myself Donald Martinez.

ASSISTANT: There is a flight with connection limit 1 and fare 100, shall I proceed for booking?

USER: Ok, please book this ticket.

ASSISTANT: Your ticket is booked, flight number 1020 with United Airlines.

USER: Thank you.

ASSISTANT: Thank you for opting us.