You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Justin Adams.

ASSISTANT: How may I aid you?

USER: I want to meet my school principal, can you please help me to book my flight ticket from ATL to HOU?

ASSISTANT: Sure, I will help you. May I know on what dates would you like to travel?

USER: I want to depart on May 20th and I will return back on May 22nd.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that, there are no flights found on your travel dates.

USER: No problem, I will find an other way to reach my destination. Thank you for the information.

ASSISTANT: Thank you for opting us.