You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I oblige you today?

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

ASSISTANT: May I have your name please?

USER: My name is Samantha Hall.

ASSISTANT: Please wait a moment.

USER: OK.

ASSISTANT: There is no reservation found on your given name.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us.

USER: Thanks for reaching us, have a good day.