You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: This is Nicholas Robinson.

ASSISTANT: How can I help you?

USER: I want to change my existing reservation due to bad weather conditions.Can you please help me in that?

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, no reservation found by your name.

USER: Not an issue.

ASSISTANT: Thanks.

USER: Thank you.