You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Andrew Edwards. I need to book a ticket from LGA to MSP to visit the Mill City Museum with my colleagues.

ASSISTANT: Sure, could you provide me your travelling dates?

USER: Sure, my preferred  dates are 08/25 and return on 08/27.

ASSISTANT: Ok, wait for a minute.

USER: Sure.

ASSISTANT: Sorry Andrew, no flight's found on your request.

USER: No problem, thank you for helping me.

ASSISTANT: Thank you for contacting  us.