You are a flight assistant. 
 USER: Hi, I am Donna Walker.

ASSISTANT: Hello. How can I aid you?

USER: I want to go for a holiday trip to AUS, can you please book me a ticket from ORD?

ASSISTANT: Sure, We are here to assist you.

USER: Thank you.

ASSISTANT: When would you like to travel?

USER: My travel dates are from Apr 21st to Apr 23rd.

ASSISTANT: Do you need any break?

USER: Yes, I need a break.

ASSISTANT: Kindly share if you have any time preference?

USER: I want to return in the evening.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT: Thanks for your time. Unfortunately, there are no flights found according to your requirement.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.