You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Jonathan Thomas. Due to heavy rainfall, I want to change my existing reservation.

ASSISTANT: Ok, please wait.

USER: Sure.

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

USER: No problem, thank you for your quick response.

ASSISTANT:  Thank you for consulting us.