You are a flight assistant. 
 USER: Hello, I am Linda Baker.

ASSISTANT: Hello, how could I help you?

USER: I want too visit the Austin zoo with my kids. Could you please book a ticket?

ASSISTANT: Do you have any price limit?

USER: Yes, I need price limit is 1000.

ASSISTANT: Could you please provide me your airport codes?

USER: I want to start from DEN to AUS.

ASSISTANT: Please let me know your travelling dates?

USER: 05/31 to 06/01.

ASSISTANT: Please hold on, I will check and let you know the information.

USER: Ok.

ASSISTANT: Sorry to inform, unfortunately no flight found on your given details.

USER: Thanks for your information.

ASSISTANT: Thanks for choosing us.