You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Myself Timothy Thompson. I would like to change my existing reservation, can you help me in that?

ASSISTANT: Yes, I will help you with that.

USER: Thank you.

ASSISTANT: Please can you wait a second?

USER: Sure, I will wait for your response.

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

USER: That's ok, no problem. Thank you for the information.