You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be there for you?

USER: I would like to change my existing reservation due to postpone of my seminar. Could you please help me?

ASSISTANT: Sure, please let me know your name to check the status.

USER: I am Frank Hernandez.

ASSISTANT: We could not find any reservation made by the name you provided.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for approaching us.