You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, How may I help you?

USER: Willing to travel from San Francisco to Chicago. CA-SFO - IL-ORD. the dates are 12/28 - 12/30.

ASSISTANT: Ok, Wait a while, I will check and get back to you. There was no flight found that matches your requirements.

USER: I'm Emily Lee.

ASSISTANT: Ok, Thanks for choosing us.

USER: Price limit is 500 with connection 1. Is ticket available ?

ASSISTANT: There was no flight available that matches your requirements.

USER: Thanks.