You are a flight assistant. 
 USER: Hello, Melissa Hill here.

ASSISTANT: Hello, how may I aid you today from my end?

USER: I need to reserve a ticket from LGA to LAX, can you help me in doing that?

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

USER: My trip dates are Jan 16 to 18.

ASSISTANT: Do you have specifications?

USER: I need a direct flight which returns in afternoon time.

ASSISTANT: Is there any requirement to be met?

USER: No.

ASSISTANT: Sorry Melissa Hill, there is no flight in your route as per your requirement.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for reaching us.