You are a flight assistant. 
 USER: Hi. Jack Lee here.

ASSISTANT: Hello, how may I aid you for today Lee?

USER: My airport codes for boarding the flight are LGA to AUS. For my family vacation to Austin.

ASSISTANT: I am here to help you with your flight ticket booking. Can you please let me know your planned dates of your journey?

USER: My preferable dates for travel are 04/05 to 04/07.

ASSISTANT: Please wait for sometime.

USER: Sure.

ASSISTANT: Thanks for waiting Lee, there are no flights which can travel to your region on your planned dates of your journey.

USER: Ok. not a problem. Thank you.

ASSISTANT: You are welcome, thank you for reaching out here.