You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Myself Samuel Hernandez, can you help me to book a flight ticket from IAD to OAK?

ASSISTANT: Sure, I am here to help you in booking. May I know your travel dates to proceed further?

USER: Ok, please book for the dates 06/17 and 06/19.

ASSISTANT: Ok, please wait. Sorry, there is no flight as per your requesting travel dates.

USER: Ok, may be there is heavy bookings. Thank you for assisting me.

ASSISTANT: Thank you for approaching us.