You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Robert Robinson.

ASSISTANT: How can I assist you?

USER: I want to change my existing reservation as my exam got postponed.

ASSISTANT: Ok.

USER: Please help me out.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Give me a minute to check the reservation on your name.

USER: Ok.

ASSISTANT: Thank you for giving your time. I did not find any reservation on your name.

USER: No issues, thank you for the response.

ASSISTANT: Thank you for contacting us.