You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Anna Robinson.

ASSISTANT: How can I assist you?

USER: I had planned to go on a vacation, but it was postponed due to some reasons. Can you change my recent reservation?

ASSISTANT: Sure, give me a minute. Sorry, there is  no reservation found under your name.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Anyways, thank you for your help.