You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Micheal Martinez. Can you please help me in changing my recent reservation?

ASSISTANT: Please wait a while.

USER: Ok, I will wait for your reply.

ASSISTANT: There is reservation found on your name, please share your desired travel dates.

USER: My travelling dates are Sept 22 and Sept 24.

ASSISTANT: May I know your preferred airport codes please?

USER: My travelling airport codes are SEA to DFW.

ASSISTANT: Do you have any other specifications?

USER: I need my return ticket at evening time. I also need direct flight.

ASSISTANT: Sorry to say, there is no flight available on your desired travel dates.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for opting us.