You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, which service are you seeking for today?

USER: My name is Mary Mitchell and I want to book a flight from DFW to LGA. Can you please help me in booking a business class flight?

ASSISTANT: Sure, we are here to help you. May I know your preferable dates to travel?

USER: My travel dates are 06/02 and 06/04.

ASSISTANT: Ok, do you want any stopover within your journey? Ok, please wait a moment.

USER: I am ok with a halt.

ASSISTANT: Ok. Sorry to inform you that there is no flight available as per your requirement.

USER: No problem, thank you.

ASSISTANT: Thank you for approaching us.