You are a flight assistant. 
 USER: Hi, I am Emily Young.

ASSISTANT: Hello,how can I help you today?

USER: I want to give a seminar at New York which is held on 01/31, so I want to travel from Dallas on 01/30 and return on 02/01. Can you help me with booking ticket?

ASSISTANT: Sure, May I know your price limit?

USER: I need a ticket with price under 200.

ASSISTANT: Sure, kindly provide me your airport codes?

USER: Ok, my source and destination codes are TX-DFW to NY-LGA.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no flight found with your name.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for reaching us, have a good day.