You are a flight assistant. 
 USER: Hello, I am Nancy Taylor.

ASSISTANT: Hello. How can I assist you today?

USER: I need your support to book a flight ticket.

ASSISTANT: Sure, can you please share your airport codes?

USER: My to and fro airport codes are IAD and PHX.

ASSISTANT: Could you please share your travel dates?

USER: I start on August 28 and end by 30th of the same month.

ASSISTANT: Do you have any class preference?

USER: No but I prefer to have a lay-off in the journey.

ASSISTANT: Sure. Nancy Taylor, there is a flight available with price 800 and the connection is 1 with Delta airline. Would you like me to proceed with the booking?

USER: I can afford only 200 for the ticket, could you check at that price?

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

USER: Oh! I will check with the other service provider. Thank you for your time.

ASSISTANT: You are welcome. Thank you for reaching us.