You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what kind for service do you want?

USER: I am planning to participate my brother birthday function at New York. Can you help me to book a ticket?

ASSISTANT: Sure, I will help you. May I know your name?

USER: Nicholas Davis here.

ASSISTANT: When you are going to depart and return?

USER: My journey dates are 03/20 and 03/22.

ASSISTANT: What are the airport codes?

USER: My airport codes are Dallas, DFW to New York, LGA. I need break in my journey.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flight is available on your journey dates.

USER: No problem, Thank you.

ASSISTANT: Thank you for contacting us. Have a nice day.