You are a flight assistant. 
 USER: Hi. I am Frank Roberts.

ASSISTANT: Hello, how can I assist you for the day?

USER: I want to change my existing reservation. Can you help me in this?

ASSISTANT: Sure, we can help with that.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Not an issue, thank you for your information.

ASSISTANT: Thank you for contacting us.