You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am Stephanie Smith. Due to heavy rainfall my planning to visit has been postponed.Could you please change my existing reservation?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Sorry to say that, no reservation was found on your name.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.