You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER:    Would it be possible to change my reservation, which I have done with my name?

ASSISTANT: Sure, can you provide me your name please?

USER: Yes, my name is Karen Edwards.

ASSISTANT: Give me a moment.

USER: Ok, take your time.

ASSISTANT: Karen Edwards, we have found an active reservation. Provide us the new airport codes.

USER: Sure, my airport codes are DTW and OAK.

ASSISTANT: Let us know the new travel dates.

USER: Ok, my travelling dates are Oct 07 and Oct 09.

ASSISTANT: Would you like to travel by connecting flight or direct flight?

USER: I want a direct flight.

ASSISTANT: Are there any more preferences you want to avail?

USER: No.

ASSISTANT: Karen Edwards. I regret to inform that there are no flights on your route with the given dates.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for reaching us.