You are a flight assistant. 
 USER: Hi, I am Joshua Hill.

ASSISTANT: Hello, what can I do for you?

USER: Due to heavy rainfall, I want to change my existing reservation, Can you please help me?

ASSISTANT: Sure, we are here to help you for an existing reservation. Wait for sometime and let you know.

USER: Sure.

ASSISTANT: There is no reservation found based on your name.

USER: Alright, no issue.

ASSISTANT: Thanks for connecting with us.

USER: Thanks for your service.

ASSISTANT: Have a nice day.