You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I help you?

USER: I want to book a ticket from IAH to LGA.

ASSISTANT: Sure, May I know the travel dates?

USER: Travelling dates are from Aug, 5 to Aug, 7.

ASSISTANT: May I know your name?

USER: My name is Mark Hall.

ASSISTANT: Please wait a minute.

USER: Ok.

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

USER: Thanks.

ASSISTANT: Thank you for availing us.