You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I render you today?

USER: I am Brenda Clark.

ASSISTANT: Ok.

USER: I want to change my existing reservation due to my holiday trip got postponed, can you please help me with that?

ASSISTANT: Sure Brenda Clark, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for approaching us.

USER: Thanks for your kind information.