You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Myself Samantha Jones, due to some business meeting I am going to change my existing reservation. Could you please help me in changing the reservation?

ASSISTANT: Sure, I am gleeful to help you. Please wait for a moment I will check your complete details and proceed further.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say, there is no reservation on your name in my database.

USER: Not an issue, anyhow thank you very much for your help.

ASSISTANT: Thank you for reaching us, have a nice day.