You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am James Collins.

ASSISTANT: What type of service do you need from our flight ticket booking agency?

USER: I want to change my recent reservation to new travelling dates, would it be possible to change it?

ASSISTANT: Sure, I will help you in changing the ticket details. Can you please wait a minute?

USER: Sure, take your time.

ASSISTANT: I am really sorry to inform you that, I have not found any active reservation with your name in our database to change.

USER: It's ok, thanks for your information.

ASSISTANT: You are welcome. Thank you for reaching us.