You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Rachel Brown. I made a reservation earlier to attend a meeting in Houston but, due to some problems with clients meeting venue got changed to Los Angeles. Can you change my reservation?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: Ok, thank you informing me.

ASSISTANT: Thank you for opting us.