You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to book a ticket from IAH to JFK. Can you please help me out to book a ticket for me?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: I am planning to travel on May 21 and return back on May 23.

ASSISTANT: May I know your name to proceed further?

USER: My name is Rebecca Young.

ASSISTANT: Sorry Rebecca Young, there is no flight as per your request.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us Rebecca Young.