You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you?

USER: I am Pamela Mitchell.

ASSISTANT: Ok.

USER: Due to my health problem, I want to change my resent reservation, can you please help me in that?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Ok.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for reaching us, have a nice day.