You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Sure, can you give me your name?

USER: Margaret Davis here.

ASSISTANT: Sorry, there is no reservation found under your name.

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

ASSISTANT: Thank you for reaching us.