You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Robert Garcia.

ASSISTANT: Robert Garcia, how can I aid you today?

USER: Can you please book me a flight ticket to New York, LGA to attend a music festival?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: I am planning to depart on Sept 16 and return on Sept 18.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you. Can you please mention your source airport code please?

USER: I wish to take off from Houston, IAH.

ASSISTANT: Ok, hold on for a moment.

USER: Sure.

ASSISTANT: Sorry Robert Garcia, there are no flights available on your requested dates.

USER: It's ok, no problem. Thank you for the information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.