You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How may I help you?

USER: I am Jason Smith. I want to book a flight ticket from Oakland, CA - OAK to Chicago, IL - ORD to attend a business meeting. Could you help me in booking a flight ticket?

ASSISTANT: Sure. Please provide your journey dates?

USER: I would like to fly on 07/19 and return on 07/21.

ASSISTANT: Please specify ticket price limit?

USER: I can afford up to 5000.

ASSISTANT: No flight found with your requirement.

USER: Not an issue. Thank you.

ASSISTANT: Thanks.