You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My name is Melissa Nelson.

ASSISTANT: Yes, Melissa.

USER: I am planning to meet my colleagues, can you book a flight ticket from CLT to LAS?

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

USER: My travelling dates are from 10/19 to 10/21.

ASSISTANT: Ok, let me check.I will confirm you.

USER: Ok.

ASSISTANT: Melissa, there is a flight with Delta airline and price is only 100. Shall I proceed?

USER: Thank you for finding me a flight ticket for just 100, please proceed booking.

ASSISTANT: Your ticket has booked with the flight number 1002.

USER: Thank you for your quality service.

ASSISTANT: Thank you for reaching us.Have a safe journey.