You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Catherine Wright.

ASSISTANT: Nice to meet you Catherine.

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

ASSISTANT: Sure, I will help you with the change of flight reservation. Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no flight reservation on your name to change it.

USER: No worries, thank you for the information.

ASSISTANT: Thank you.