You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I render you today?

USER: I am Helen Turner. As my holiday trip has been postponed, I need to change my reservation. Can you please help me?

ASSISTANT: Sure, please wait a moment I will check the reservation status.

USER: Sure.

ASSISTANT: Than you for waiting, we did not found any reservation by your name.

USER: No problem. Thank you.

ASSISTANT: Thank you for approaching us.