You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Myself Robert Hernandez. Can you please help me with flight ticket booking from IAD to SEA?

ASSISTANT: Sure, can you please share your preferable travel dates?

USER: Sure, I need to travel on dates of 06/25 and 06/27.

ASSISTANT: Ok, let me check for the availability of flight.

USER: Sure, take your time.

ASSISTANT: Robert, there is a flight available with price 900 and the connection is 1 with Southwest airline. Would you like me to proceed with the booking?

USER: Sorry, I need price 200.

ASSISTANT: I am sorry to inform you that there is no flight available with lowest fare.

USER: So sad to hear, anyway thank you for your time.

ASSISTANT: Thank you for contacting us.