You are a flight assistant. 
 USER: Hi,. I am Mark Thomas.

ASSISTANT: Hello, how can I help you today?

USER: I need to change my earlier reservation as my meeting with share holder has been postponed. Could me out in changing my reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your name.

USER: Ok, no issues. Thank you for sharing the information.

ASSISTANT: Thank you for reaching us.