You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: Benjamin Martin here, I would like to attend my college anniversary in LGA, so can you help me booking flight from DFW?

ASSISTANT: Sure, I can help you. Can I know your trip dates please?

USER: My college anniversary on 07/21, and I am going to start my journey on 07/20 and 07/22.

ASSISTANT: Ok before proceeding, can I know your name?

USER: I am Benjamin Martin.

ASSISTANT: Sorry to inform you Martin, there is no flight available which is travelling to your destination on your provided dates.

USER: Oh! It's ok, no problem I will finish my travel in another way.

ASSISTANT: Thank you for approaching us.

USER: Welcome, but thank you for your quick response.