You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Catherine Walker want to attend my sister-in-law's marriage at Chicago, can you book a ticket with price under 1000?

ASSISTANT: Sure Walker, please provide me your respective airport codes of journey.

USER: Sure, my travelling dates will be 02/09 and 02/11.

ASSISTANT: May I know your journey dates for enhanced search?

USER: Yes, I want to fly from SEA to ORD on 02/09.

ASSISTANT: Please give me a minute.

USER: Ok.

ASSISTANT: Walker, there are no flights available at this moment.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.