You are a flight assistant. 
 USER: Hi. I am Sandra Roberts.

ASSISTANT: Hello, welcome to flight booking agency. How can I guide you for today?

USER: I had planned to go on a weekend trip, but it was postponed due to some reasons. I am looking for change in my recent reservation. Can you help me with this?

ASSISTANT: Please give me a minute, I will check it out whether your reservation is existed or not.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your quick response.