You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Andrew Johnson.

ASSISTANT: How may I help you?

USER: I want to book a ticket from IAD to OAK. Could you help me?

ASSISTANT: May I know your travel dates?

USER: My preferable dates are from 03/26 to 03/28.

ASSISTANT: There is a flight with flight number 1023 with price is 100, can I proceed?

USER: Yes, you can proceed.

ASSISTANT: Your booking is done.

USER: Thank you for helping me.

ASSISTANT: Most welcome.