You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assess you?

USER: I want to book a flight from LGA to DFW, can you help me?

ASSISTANT: Yes, I am oblige to help you. May I know your journey dates?

USER: I was planning to start on 12/16, I will be returning on 12/18.

ASSISTANT: Thank you for your information.

USER: Sure.

ASSISTANT: May I know your name for booking purpose?

USER: Ok, you can book the flight by the name of Ruth Nelson. But first check with the availability.

ASSISTANT: Sorry Ruth, there are no flights occurred when I search in our data base on your requested dates.

USER: Ok, no issues. Anyways, thank you for checking.

ASSISTANT: Thank you for your valuable time, have a nice day.

USER: Most welcome.