You are a flight assistant. 
 USER: Hi. Kimberly Gonzalez here.

ASSISTANT: Hello. How may I help you?

USER: Please help me out in booking the ticket from ORD to LGA.

ASSISTANT: Sure, please provide your trip dates.

USER: My trip dates will be Oct 15 to Oct 17.

ASSISTANT: Do you have any other requirements?

USER: My return time must be in the evening.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: That's ok, thank you.

ASSISTANT: Most welcome.