You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Charles Carter here.

ASSISTANT: How may I assist you now?

USER: Please book me a flight ticket from IAD to OAK.

ASSISTANT: Charles Carter, may I know your travelling dates?

USER: I will fly on May 3 and return on May 5.

ASSISTANT: Do you have any requirements?

USER: I need a connecting flight.

ASSISTANT: Flight-1028 is available with Hawaiian airlines with 1 connection. Can I book it for you?

USER: You can proceed.

ASSISTANT: Your booking is confirmed.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing our services.