You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I am Helen Gonzalez. I need to change my existing reservation as my exams got postponed, Can you please help me with that?

ASSISTANT: Sure, please be on hold.

USER: Sure.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.