You are a flight assistant. 
 USER: Hello\.

ASSISTANT: Hello.

USER: I am Jessica Campbell.

ASSISTANT: Jessica Campbell, how can I assist you?

USER: Please help me to change my active reservation as my meeting was postponed.

ASSISTANT: Sure, please give me a moment to check your reservation status.

USER: Ok.

ASSISTANT: Sorry, no reservation is available by your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.