You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Myself Jack Turner, due to some seminars I am going to change my existing reservation. Could you please help me in changing the reservation?

ASSISTANT: Sure, I am here to help you. Please wait for a moment to check your reservation status.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say, no reservaton found on your name in my records.

USER: Not a big problem.

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

USER: Anyhow thank you very much for your information.