You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Due to an emergency, I want to change my reservation. Can you help me?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please help me with your name.

USER: Melissa Campbell here.

ASSISTANT: Thank you. Please allow me a minute.

USER: Sure.

ASSISTANT:  Melissa Campbell, I highly regret to inform you that there is no booking found on your name.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for reaching us. Have a great time.