You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: Owning to an emergency I want to change my existing reservation. Can you please help me with this?

ASSISTANT: Sure, please share me your good name.

USER: Sure, my name is Melissa Brown.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.