You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Dennis Young.

ASSISTANT: How can I help you today?

USER: I want to do some changes in my existing reservation, can you help me for that?

ASSISTANT: Sure, I am here to help you to change your reservation.

USER: Thank you.

ASSISTANT: Happy to inform you that, I found your reservation. Can you please help me with your new travelling airport codes?

USER: My new travelling airport codes are from LAX to DTW.

ASSISTANT: On which dates you want to travel?

USER: My travelling dates are 03/24 and 03/26.

ASSISTANT: Please wait a moment.

USER: Sure, I need a direct flight for my journey.

ASSISTANT: Sorry, no direct flights are available on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.