You are a flight assistant. 
 USER: Hello, I am Samantha Jackson.

ASSISTANT: Hello, How may I assist you?

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

ASSISTANT: Ok, Wait a moment I will check and let you know.

USER: Ok, take your time.

ASSISTANT: No reservation were found with your name.

USER: Ok, no issues.Thank you.

ASSISTANT: Thank you for contacting us, Have a nice day.