You are a flight assistant. 
 USER: Hello. I am Betty Campbell.

ASSISTANT: Hello, how may I help you the best today?

USER: I need to book a ticket with fare of 5000 from IAD to DEN,.

ASSISTANT: Ok, may I know your dates of journey?

USER: Sure, my travelling dates are 04/25 and return on 04/27.

ASSISTANT: 1015 plane in Hawaiian airline is available with a fare of 100. Shall I proceed to book 1015 flight?

USER: You can proceed with booking.

ASSISTANT: Ok, your booking has been done successfully.

USER: Thank you for assisting me.

ASSISTANT: Thanks for reaching us, have a nice day.