You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I need to change my existing reservation, as my planned trip got  with my friend got post-phoned.  Can you please help me out?

ASSISTANT: Sure, may I know your good name please?

USER: Thank you for considering my request. My name is Michael Williams.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your service.