You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I would like to book a flight ticket on 11/04 and a return ticket on 11/06, can you please help me with booking a ticket?

ASSISTANT: Sure, I am here to help you. Could you please tell your travelling airport codes?

USER: Sure, I will be depart from LAS and land on IAD.

ASSISTANT: Ok, please let me know your name to proceed further.

USER: Sure, I am Christine Evans.

ASSISTANT: Ok, I searched for the available flights, there is a flight airlines Delta with service number 1020. Can I book your flight ticket?

USER: Ok, please book it for me.

ASSISTANT: Ok, your ticket booking is successful.

USER: Thank you for your service.

ASSISTANT: You are welcome. Thank you for reaching us, have a safe flight.