You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

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

ASSISTANT: Ok, may I know your name to check with your previous booking status?

USER: Pamela Lopez here.

ASSISTANT: Ok, please be on hold for a while.

USER: Sure.

ASSISTANT: Pamela Lopez, there is no reservation found by your name.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for choosing our services.