You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gary Evans.

ASSISTANT: How may I support you for the day?

USER: I need your assistance in changing my earlier reservation as my plan to go for holiday trip got postponed.

ASSISTANT: Sure, I will help you out in this.

USER: Thank you.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thank you for your time.

USER: Ok.

ASSISTANT: We did not find any reservation in your given name.

USER: No problem. Thank you for the information.

ASSISTANT: Thank you for opting us. Hope to serve you again.