You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER:  I am Jack Perez want to travel to Dc-IAD to meet my sister on her graduation day. Can you book a ticket on 06/20?

ASSISTANT: Sure Jack, please provide your return date.

USER: I will return on 06/22.

ASSISTANT: Could you please forward your source code?

USER:  I will depart from WA-SEA.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: There is a Spirit 1004 airline with fare of 100 which matches your travelling dates.

USER: Ok, you can confirm.

ASSISTANT: Shall I proceed with booking? Your booking has been confirmed on name of Jack Perez.

USER: Ok. Thank you.

ASSISTANT: Thank you for approaching us, have a nice day.