You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mary Harris.

ASSISTANT: How may I guide you today?

USER: I would like to book a ticket from MSP to LGA, can you please help me out?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: I am travelling on these dates 04/22 and 04/24.

ASSISTANT: Please wait for a minute. I am sorry to say that there is no flight found.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for reaching us. Have a great day.