You are a flight assistant. 
 USER: Hello. My name is Nichole Jones.

ASSISTANT: Hello. Jones how may I help you?

USER: Mistakenly I had booked my flight ticket details, so I want to change my existing reservation. Can you help me in changing my reservation details?

ASSISTANT: Sure Jones, Wait a moment.

USER: Ok.

ASSISTANT: Jones there is no reservation found for you.

USER: Ok, no problem. Thank you for your help.

ASSISTANT: Welcome, thank you for choosing us.