You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Frank Campbell.

ASSISTANT:  How can I aid you?

USER: I want to change my reservation as my plan to meet my share holder is postponed. Can you help me with that?

ASSISTANT:  Ok, please wait.

USER: Sure.

ASSISTANT:  Sorry, no reservation was found on your name.

USER: Ok, no issues. Thanks for the information.

ASSISTANT:  Thank you for availing us.