You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Edward Gonzalez.

ASSISTANT: How may I be of your help?

USER: I want to change my existing reservation as my exam got rescheduled. Please help me out.

ASSISTANT: Sure, please wait a while I will check and let you know.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not found any reservation on this name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thanks for opting us.