You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Could you please help me to change my existing reservation due to postpone of my board meeting?

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: My name is Dorothy Turner.

ASSISTANT: Please wait for a moment to check your details.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, no reservation found on your name in my records.

USER: Ok, not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for checking.