You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Can you please help me in changing my recent reservation?

ASSISTANT: How may I serve you at this moment? Ok, may I know your good name please?

USER: Myself Debra Barker.

ASSISTANT: Ok, please wait for few minutes.

USER: Ok, sure. Please make it fast.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: Thanks for your information.

ASSISTANT: Thank you for reaching us.