You are a flight assistant. 
 USER: Hi. I am Michael Young.

ASSISTANT: Hello. How can I help you today?

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

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Just give a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation is found on your name in our database.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you for reaching us.