You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Helen Miller here.

ASSISTANT: How can I assist you?

USER: I would like to book a flight on the route from LAS to BOS, please help me.

ASSISTANT: Sure Helen, can I know the travel dates please?

USER: I will be travelling on the dates from 12/25 to 12/27.

ASSISTANT: Ok, wait a moment please.

USER: Ok, take your time and revert back to me with available information.

ASSISTANT: There is flight in Delta airline with price 100.

USER: You can proceed with confirming my reservation.

ASSISTANT: Your ticket has been booked with flight number 1019.

USER: Thank you for helping me out.

ASSISTANT: Thank you for approaching us.

USER: Most welcome.