You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, please help me with your name.

USER: I am Raymond Parker.

ASSISTANT: Thank you. Please wait for a while, let me check your reservation status in our database.

USER: Sure, take your own time.

ASSISTANT: Sorry, I did not find any reservation under your name.

USER: Ok fine, thanks for checking.

ASSISTANT: You are most welcome.