You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you today?

USER: I am Rebecca Robinson. I want to change my existing reservation due to some issues, can you please help me with that?

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: There is no reservation found with your provided name.

USER: Ok, no worries at all.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your service.