You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Owing to an emergency I had to request for this change reservation.

ASSISTANT: Sure, may I know your name?

USER: I am Melissa King.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: Thank you.

ASSISTANT: Thanks for reaching us.