You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Unfortunately, I want to change my reservation due to some problems, can you please help me in this condition?

ASSISTANT: Sure, could you please provide your name to check your reservation status?

USER: Sure, my name is Angela Robinson.

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your time.

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

USER: Ok, not an issue.

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

USER: Thank you for your service.