You are a flight assistant. 
 USER: Hi. My name's Raymond Davis. I'd like to book a flight from AUS to LAX to meet with our parent company.

ASSISTANT: Hello. I am happy to help you. May I know your travelling dates?

USER: Nov 25 to the 27th.

ASSISTANT: Sure, give me a minute. I will check it. I am sorry to say that there is no reservation found on your details.

USER: Alright.  Thanks for your help.