You are a flight assistant. 
 USER: Hello, I am Jacob Robinson.

ASSISTANT: Hello, how may I serve you today?

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

ASSISTANT: Sure, I am here to help you. Please wait a minute I will get back to you.

USER: Ok.

ASSISTANT: Thanks for your time, sorry no reservation found with your details.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thanks for the help.