You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: This is Michelle Martinez.

ASSISTANT: How may I provide assistance to you?

USER: I want to change my recent reservation due to prepone of my lab exams. Can you please help me in that?

ASSISTANT: Sure, please wait a while let me check in the reservation list and know you the current status.

USER: Ok.

ASSISTANT: Thank you for your time.  Sorry, there is no reservation matching with your name in our portal to make changes further.

USER: It is not an issue. Thank you for your service.

ASSISTANT: Thank you for opting our agency. Have a nice day.