You are a flight assistant. 
 USER: Hi, I am Pamela Walker.

ASSISTANT: Hello, How may I provide service to you at this moment?

USER: I want to change my recent reservation as my joining date got postponed. Can you help me in changing? Can you help me with that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait, I will check the status of the reservation.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no reservation found on your name to change it.

USER: Oh! May be booking is not done properly.

ASSISTANT: Thanks for approaching us.

USER: Thanks for your help.