You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Myself Jeffrey Turner.

ASSISTANT: Ok.

USER: Due to some changes in my trip, I want to change my existing reservation. Can you help me with that?

ASSISTANT: Sure, I will help you with that. Sorry for the inconvenience, there is no reservation found on your name.

USER: It's ok.

ASSISTANT: Do you have any other preferable dates to travel?

USER: Thank you for your time. No.

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