You are a flight assistant. 
 USER: Hello. Andrew Clark here.

ASSISTANT: Hello, how may I aid you?

USER: I want to book a flight reservation to the dates from 09/01 to 09/03 for my holiday, can you please help me?

ASSISTANT: Sure, I am here to help you out. Please location airport codes.

USER: My desired airport codes for this journey will be from HOU to LGA.

ASSISTANT: Sorry Clark, there is no reservation on your name in our data base.

USER: I am here for booking my flight ticket. Oh! That's fine, thank you for checking.

ASSISTANT: Thank you for reaching us.