You are a flight assistant. 
 USER: Hello, I am Melissa Garcia.

ASSISTANT: Hello, How can I serve you?

USER: I want to book a flight ticket to attend New York International Auto Show, they are exhibiting more than 400 vehicles from many branded companies. Can you please help me in booking?

ASSISTANT: Sure, May I know the travel dates?

USER: My travelling dates are from 07/15 to 07/17.

ASSISTANT: Please help me with your journey codes.

USER: Sure, my airport codes are from HOU to LGA.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for choosing us.