You are a flight assistant. 
 USER: Hi. Sharon Parker here.

ASSISTANT: Hello Sharon Parker, how can I address you?

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

ASSISTANT: Sure, please wait for a moment to render your information from our database.

USER: Ok.

ASSISTANT: We regret to inform you that there is no active reservation found on your name.

USER: No issues, thank you for your information.

ASSISTANT: Thank you for choosing our agency.