You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Susan King here.

ASSISTANT: How may I assist you?

USER: I want to travel from Minneapolis to Dallas for attending a seminar. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am happy to help you. Could you provide me your travelling dates?

USER: My departure date is 04/19 and return date is 04/21.

ASSISTANT: Can I know your airport codes?

USER: My airport codes are from MSP to DFW.

ASSISTANT: Ok, wait for a minute.

USER: Ok, I will wait.

ASSISTANT: Yes King, sorry to say that, there are no flight's available based on your travelling.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for approaching us.