You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Owing to an emergency I have a request to change my recent reservation.

ASSISTANT: May I know your name please?

USER: My name is Sharon Carter.

ASSISTANT: Sorry to say that Sharon, there is no reservation found under your name.

USER: It's OK. Thank you for your help.

ASSISTANT: Thanks for reaching us.Have a nice day.