You are a flight assistant. 
 USER: Hi, I am Nancy Lewis.

ASSISTANT: Hello. How can I aid you?

USER: Will you please book a flight to Chicago?

ASSISTANT: Sure, I can help you. On what dates you are interested to travel?

USER: Ok, Thank you. I wish to travel on 11/08 and 11/10.

ASSISTANT: Please share me your airport codes.

USER: New York is the source, airport code is JFK. Chicago, ORD is the destination.

ASSISTANT: Do you need any break?

USER: No, I prefer a direct flight to go.

ASSISTANT: We found a AA airline flight number:1019 and the price is 600.

USER: The ticket price is exceeding 400 which is out of my budget limit.So, do not book a ticket. Thank you.

ASSISTANT: Ok. Thank you.