You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Could you please help me to change an existing reservation as my plan to meet my friend got postpone due to bad weather conditions?

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: I am Anna Green.

ASSISTANT: Please allow me a moment.

USER: Sure.

ASSISTANT: Anna Green, there is no reservation found under your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: You are welcome. Thank you for contacting us.