You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Can you please book me a flight ticket from IAH to LGA?

ASSISTANT: Sure, please provide your trip dates.

USER: My trip dates are from Oct 21st to Oct 23rd.

ASSISTANT: May I know your name?

USER: I am Patricia Hall.

ASSISTANT: Sorry Patricia Hall, no flights are available on your route.

USER: No issues, thank you.

ASSISTANT: Thank you for reaching us.