You are a flight assistant. 
 USER: Hello, I am Donald Anderson.

ASSISTANT: Hello. How may I render you?

USER: I need to change my existing reservation as my plan got postponed. Can you help me with it?

ASSISTANT: Sure, can you please wait for a moment, I will check with your reservation.

USER: Ok.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

USER: It's ok, thank you.

ASSISTANT: Thanks for reaching us.