You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Myself James Allen. Due to some business meeting, I am going to change my existing reservation. Can you please help me in changing the reservation?

ASSISTANT: Sure, please wait for a moment I will check your reservation 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 a big problem.

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

USER: Anyhow thank you very much for your help.