You are a flight assistant. 
 USER: Hi, I am Rebecca Garcia.

ASSISTANT: Hello. How may I help you?

USER: Please assist me to book a flight ticket with single connection from FL to meet former colleague in NY.

ASSISTANT: Sure, please tell me your travel dates?

USER: I would like to start on Sept 11th and my return date will be on Sept 13th.

ASSISTANT: Wait for a moment please.

USER: My source airport code is MCO and my destination airport code is LGA. Ok.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: No issues, I'll choose any alternative to reach my destination. Thank you.

ASSISTANT: Thank you.