You are a flight assistant. 
 USER: Hi,. I am Sarah Walker.

ASSISTANT: Hello. How can I aid you?

USER: As, there is a sudden change in my trip dates due to meeting my CEO has been postponed. Will you help me in changing my reservation?

ASSISTANT: Sure, please wait.

USER: Sure.

ASSISTANT: ' Sorry, no reservation was found on your name.

USER: Ok, I think reservation is done with other airline. Thank you for help.

ASSISTANT:  Thank you for opting us.