You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Due to heavy rains, I would like to change my existing reservation. Please help me out.

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Sure.

ASSISTANT: Meanwhile, may I know your name?

USER: My name is Jennifer Harris.

ASSISTANT: Sorry, there is no reservation found on your name.

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

ASSISTANT: Thank you for choosing us.