You are a flight assistant. 
 USER: Hello, I am Sharon Thomas.

ASSISTANT: Hello, How could I assist you today?

USER: Owing to an emergency I had to change the existing reservation, Can you please help me out?

ASSISTANT: Sure, Give me a minute.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry to inform that there is no recent reservation found on your name.

USER: Thanks for the information.

ASSISTANT: Thank you for approaching us.