You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Linda Clark.

ASSISTANT: How may I guide you today?

USER: I want to change my existing reservation due to postpone of event at Orlando.

ASSISTANT: Sure, I will help you with that. Please wait for a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for reaching us.