You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: My trip is postponed, I would like to change my reservation. Can you please help me out?

ASSISTANT: Sure, I will help you with this.

USER: Thank you.

ASSISTANT: Can you please provide your name to check for your reservation status?

USER: Sure, my name is Mary Martin.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Mary Martin, there is no active reservation found under your name in our database to change it.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for contacting us.