You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be your helping hand today?

USER: I would like to change my reservation due to sudden change in my schedule. Please help me with changing the reservation.

ASSISTANT: Sure, we are glad to help you. May I know your name please?

USER: I am Emma Walker.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry we couldn't find any reservation on your name.

USER: Fine, thank you.

ASSISTANT: Thank you for reaching us. Have a good day.