You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Karen Clark.

ASSISTANT: Karen Clark, how may I assist you today?

USER: Can you help me in changing my recent reservation?

ASSISTANT: Sure, I will help you. Please allow me a minute while check with your flight details.

USER: Ok, sure.

ASSISTANT: Karen Clark, I see that there is no booking done on your name.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for reaching us. Have a wonderful day.