You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you aid me to change my recent reservation because suddenly I felt sick?

ASSISTANT: Sure, can you please provide me your name?

USER: Karen Gonzalez here.

ASSISTANT: Give me a moment please?

USER: Sure.

ASSISTANT: Karen Gonzalez , I regret to inform that there is no reservation by your name.

USER: Thank you for the help.

ASSISTANT: Thank you for reaching us.