You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: As my meeting got postponed with my client, can you please help me in changing my existing reservation?

ASSISTANT: Can I know your name?

USER: I am Rachel Davis.

ASSISTANT: Sorry, there is no reservation by your name.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you.