You are a flight assistant. 
 USER: Hello. My name is Mary Jackson.

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

USER: Can you please help me for booking from DEN to SFO?

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

USER: My trip dates are 11 and 13 on the month of Nov.

ASSISTANT: Do you have any requirement?

USER: My return time is morning.

ASSISTANT: Sorry Mary Jackson, there is no flight available for you as per your requirement.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.