You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Ronald Perez.

ASSISTANT: How may I guide you today?

USER: Can you please change my existing reservation, due to heavy rains?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a while, I will get back to you.

USER: Sure.

ASSISTANT: I am sorry to say that there is no reservation found under name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for reaching us.