You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER:  I want to change my existing reservation due to sudden rainfall at my source. Can you please help me with this?

ASSISTANT: How may I help you? Ok, ill help you with that.

USER: Thank you.

ASSISTANT: May I know your name please to check the status of your reservation?

USER: Myself Edward Turner.

ASSISTANT: Thank you. Please stay online for a while, I will check your reservation status and let you know.

USER: Sure, I will be waiting.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal to make changes further.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.