You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Brandon Lopez. Can you help me to change my recent reservation, which I have given wrong details on previous reservation?

ASSISTANT: Ok, please wait for a while to get a reservation of your's.

USER: Sure.

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

USER: That's fine, no issue, anyways thanks for your information.

ASSISTANT: Welcome, have a good day.