You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I need to change my reservation as my plan to go for trekking got postponed. Can you help me?

ASSISTANT: Sure, may I know your name to process further.

USER: I am Angela Hill.

ASSISTANT: Just wait for a moment let me check your reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, We regret to inform you that there are no flights found on your name.

USER: Ok fine, thanks for your assistance.

ASSISTANT: Thank you for choosing us.