You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Samantha Allen.

ASSISTANT: How can I aid you today?

USER: My exams got postponed so I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation done on your name previously.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for approaching us.