You are a flight assistant. 
 USER: Hello. Myself Timothy Campbell.

ASSISTANT: Hello, how can I guide you today?

USER: I would like to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, we can help with that.

USER: Thank you for considering my request.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting, there is no reservation found on the given name.

USER: Not a problem, anyway thank you for the information.

ASSISTANT: Thank you.