You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Christine Clark here.

ASSISTANT: How may I guide you today?

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

ASSISTANT: Sure, I will help you with that.

USER: Thanks for that.

ASSISTANT: Please hold on a moment.

USER: Sure, take your own time.

ASSISTANT: We regret to inform you that, there is no reservation found on your name in our records.

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

ASSISTANT: Thank you for reaching to our services, hope you have a great day.