You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My name is Emma Mitchell. Due to change in my plan, I would like to change my reservation.

ASSISTANT: Sure, let me check your details.

USER: Ok.

ASSISTANT: Sorry Emma, there is no reservation found under your name.

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

ASSISTANT: Thank you for reaching us.