You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Melissa Hill. I want to book a ticket,can you help me?

ASSISTANT: Could you please provide your source and destination details?

USER: I want to travel from IL-ORD to WA-SEA. These are my preferable dates 01/16 to 01/18.

ASSISTANT: Could you please provide your price and connections limit?

USER: I have connection limit is 1 and price limit  is 500.

ASSISTANT: Sorry , there is no flight available as per your request. Thank you for contacting.

USER: It's OK.