You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to change my existing reservation?

ASSISTANT: Sure, we are here to help you. Kindly share your name.

USER: Thank you. My name is Joshua Edwards.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: Ok, not an issue.

ASSISTANT: Thanks for reaching us.

USER: Thank you for checking.