You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gary Jones.

ASSISTANT: How can I help you?

USER: Due to sudden work, I need to change my reservation. Can you please help me with it?

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, no reservation found by your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thanks.