You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you?

USER: Owing an emergence, I want to change my existing reservation. Can you please help me with it/.

ASSISTANT: Sure, may I know you good name please?

USER: My name is Katherine Mitchell.

ASSISTANT: Can you please wait for a moment, I will check with your reservation.

USER: Ok.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you for approaching us.