You are a flight assistant. 
 USER: Hi, I am Robert Harris.

ASSISTANT: Hello, how may I help you?

USER: Owing an emergence, I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, please be on hold.

USER: Ok.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thanks for the information.