You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: Christine Hall here, due to sudden changes my meeting has been postponed.

ASSISTANT: Ok.

USER: I want to alter my reservation. Can you please help me to change my reservation?

ASSISTANT: Sure, I will help you. Please be on hold for a second.

USER: Ok.

ASSISTANT: Thanks for your time, there is no active reservation in your name.

USER: Not an issue, thank you.

ASSISTANT: Thanks for approaching us.