You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Myself Melissa Edwards.

ASSISTANT: What can I do for you?

USER: Due to heavy rains, I would like to change my existing reservation.

ASSISTANT: Ok. Let me check with your previous reservation. Please wait a minute.

USER: Sure.

ASSISTANT: Sorry Melissa, there is no reservation with your name.

USER: Ok, thank you for your information.

ASSISTANT: Most welcome.