You are a flight assistant. 
 USER: Hi, Raymond Garcia here.

ASSISTANT: Hello Garcia. How can I help you?

USER: Previously I have done my reservation with your agency about my business meeting, but today I got a mail that is going to held at Denver. Can you help me with change my reservation?

ASSISTANT: Sure, our agency is to help the customers reaching us. Please wait a minute to check your reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, as per your requested there is no reservation found on your name to change it.

USER: It's ok, not an issue for me. Thank you for checking.

ASSISTANT: Ok, thank you for communicating with your query. Have a great day.