You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I guide you?

USER: I am Melissa Nelson. Actually, I am planning to visit my friend birthday party.Can you help me out?

ASSISTANT: Sure, may I know your travelling details?

USER: These are my airport codes IAD to SEA. I want to go on 10/19 to 10/21.

ASSISTANT: I found a flight 1023 of Delta airlines for you. Shall I book the ticket?

USER: Yes, you can proceed.

ASSISTANT: Ok, your ticket is booked Melissa.

USER: Thank you for your help.

ASSISTANT: Thank you, have a safe journey.