You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, mention your name here. So, that I can check in our database.

USER: My name is Kenneth Clark.

ASSISTANT: Thank you. Sorry, no reservation has found with your name.

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

ASSISTANT: Thanks for reaching us, have a nice day.