You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: Richard Rodriguez here. I already have an reservation to attend a meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation,.

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: I found your reservation, may I know your travelling airport codes?

USER: My trip dates will be 08/23 to 08/25.

ASSISTANT: Can you share me your planning dates?

USER: I mentioned my dates and my codes are LAX is my source code and DTW is my destination code.

ASSISTANT: Do you have any connection limit?

USER: I want direct flight.

ASSISTANT: Is there any other specifications?

USER: I want my depart time must be in the afternoon.

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

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.