You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: This is Carolyn Thompson, could you help me to book a flight? I am planning to travel from AUS on 12/02.

ASSISTANT: Sure, may I know your source and destination details?

USER: I will return from MCO on 12/04.

ASSISTANT: May I know your price limits? Sorry, no flight found for this search.

USER: OK, that is fine. Thank you for your help.