You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: My name is Jonathan Clark. Would it be possible to change my reservation, which I have done with my name?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: We found a reservation on your good name. May I know your planned travel dates?

USER: I will start on Oct 15th and return back on Oct 17th.

ASSISTANT: Please share me your source and destination points.

USER: I will board from JFK and will land to PHX.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: I want to return back in the evening.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: No issues, thank you.

ASSISTANT: Thank you for reaching us.