You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name please?

USER: I am Frank Allen.

ASSISTANT: How can I help you?

USER: I want to change my existing reservation due to heavy rains. Could you please help me for that?

ASSISTANT: Sure, please give me some time to check your details.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation found by your name. Do you want any more information please?

USER: No, thank you for your information.