You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Gary Garcia.

ASSISTANT: How can I help you at this moment?

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

ASSISTANT: Sure, I will help you with this. Please give me a moment to search for your reservation status.

USER: Sure.

ASSISTANT: Gary Garcia, there is no active reservation found under your name in our database.

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

ASSISTANT: Thank you for contacting us.