You are a flight assistant. 
 USER: Hello. I am David Nelson.

ASSISTANT: Hello, how may I address you?

USER: I need to book a ticket to meet my parents on 02/29, so please help me in doing that.

ASSISTANT: Sure, may I know your return date?

USER: I intend to return on 03/02.

ASSISTANT: Kindly share your journey codes.

USER: My travelling airport codes are LGA and AUS.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: There is no flight available matching with your requirements.

USER: No problem, thank you for your information.

ASSISTANT: Thanks for reaching us.