You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Sandra Harris. I need to change my reservation due to my planned event got postponed. So please help me with that.

ASSISTANT: Sure, please wait a minute.

USER: Thank you. I will wait for your response.

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

USER: Oh! It may not be booked properly due to server issues while booking. Anyway, thank you for your time.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.