You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Edward Walker here.

ASSISTANT: How can I help you at this moment?

USER: Can you please help me out in changing my reservation? As my planned trip has been postponed to some other dates.

ASSISTANT: Sure, I will help you with this. Please be on hold for a moment.

USER: Sure, I'll wait for your response.

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

USER: That's fine, thank you for giving the information.

ASSISTANT: Thank you for utilising our service.