You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Elizabeth Campbell.

ASSISTANT: How may I serve you today?

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: Please wait a moment, I will check the reservation list and get back to you.

USER: Sure.

ASSISTANT: Elizabeth Campbell, there is no active reservation on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you so much for choosing us.