You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you at this moment?

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

ASSISTANT: Sure, I am here to help you with this. Can you please provide your name to check your reservation status?

USER: I am Michael Miller.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Michael Miller, there is no active reservation found under your name in our database.

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

ASSISTANT: Thank you for contacting us.