You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sarah Hall.

ASSISTANT: How may I help you?

USER: I would like to change my reservation which is under my name. Can you please help me with that?

ASSISTANT: Sure, please be on hold.

USER: Sure, take your time.

ASSISTANT: Thank you for your time. Sorry, there is no reservation matching with your name in our portal to make changes further.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for opting us.

USER: You are welcome.