You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to book a flight ticket with the name of Betty Lewis.

ASSISTANT: Sure Lewis.

USER: My airport codes are from AUS to LGA.

ASSISTANT: Ok. Please tell me your trip dates?

USER: I will go on 07/13 and return on 0715.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Sorry, no flight is available for you as per your details.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: You are welcome.