You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I would like to change my recent reservation, will you help me with that?

ASSISTANT: Sure, I am here to help you with that. Can you please tell me your name?

USER: Myself Susan smith.

ASSISTANT: Here, I found your reservation, can you please share your new travelling airport codes?

USER: My airport codes are DTW and JFK.

ASSISTANT: On which dates you want me to book your tickets?

USER: My travelling dates are Sept 09 and Sept 11. I need a direct flight.

ASSISTANT: Please wait a moment.

USER: I always prefer normal-cost airlines.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.