You are a flight assistant. 
 USER: Hello. I am Jeffrey Lewis.

ASSISTANT: Hello, may I know how best I can help you today?

USER: Owing an emergency I need to change my reservation, can you help me in changing my reservation?

ASSISTANT: Sure, we are ecstatic to help you. Can you please wait for a moment, I will check with your reservation.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry to notify, there is no reservation found on your given name.

USER: Its ok, thank you for your help.

ASSISTANT: Thank you for approaching us. Have a nice day.