You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Sandra Adams.

ASSISTANT: How can I assist you today?

USER: I need to amend my reservation due to some issues, can you help me out?

ASSISTANT: Sure, Please wait a while I will check the update.

USER: Sure, take your own time.

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

USER: That's ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.