You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I need to change my reservation due to urgent meeting, can you help me?

ASSISTANT: May I know your name please?

USER: I am Christine Smith.

ASSISTANT: Please wait for while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you for reaching us.