You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Susan Harris here.

ASSISTANT: How can I assist you Susan Harris?

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 in changing the reservation.

USER: Thank you.

ASSISTANT: I have searched the database and couldn't find any active reservation under your name.

USER: That's ok, may be I have done a wrong booking.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your service.