You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I am Frank Robinson. I would like to book a ticket from LAS to LGA, can you help me?

ASSISTANT: Sure, I am glad to help you. May I know your travel dates to proceed further?

USER: My travel dates are 11/26 and 11/28.

ASSISTANT: Sorry, there are no flights available for you in this route based on your details.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us.