You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Pamela Lewis.

ASSISTANT: hello Lewis, How can I assist you?

USER: Due to some health problem I am not attending my business meeting, so can you help me out in changing an existing reservation?

ASSISTANT: Sure, Wait a minute.

USER: Ok, take your time.

ASSISTANT: Sorry to tell that there is no reservation found on your name.

USER: Ok, not an issue.

ASSISTANT:  Thank you for approaching us.

USER: Thank you for your kind help.