You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: Margaret Lee is here. Can you please reserve my flight ticket from LGA to AUS?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: My travelling dates are July 18th and July 20th.

ASSISTANT: Do you have any preferences?

USER: I need a flag stop in between journey.

ASSISTANT: Sorry, there is no flight available with your requirements.

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

ASSISTANT: You are welcome, have a nice day.