You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Deborah Harris.

ASSISTANT: How may I help you today?

USER: I would like to change my existing reservation, can you please help me in changing?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Sorry to inform you that there is no active reservation was found on your given name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thanks for reaching us.