You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I just want to change my existing reservation, due to my trip with my friends has been postponed. Can you help me to change it?

ASSISTANT: Sure, I will help you with this.

USER: Thank you.

ASSISTANT: Can you please provide your name to check your reservation status?

USER: Sure, please check my reservation on the name of Eric Evans.

ASSISTANT: Eric Evans, 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.