You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Myself Kenneth Adams. Due to some urgent office work, I am going to change my existing reservation. Can you please help me for this?

ASSISTANT: Sure, I will help you to change your reservation.

USER: Thank you very much for quick access.

ASSISTANT: Please give me a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: Not a big deal, anyhow thank you very much for your service.

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

USER: You are welcome.