You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: As I am a new joiner, I need to attend two days training session but due to some problems it has been postponed. So, aid me in changing the reservation with the name of Betty Lewis.

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Thank you. Ok, I will wait.

ASSISTANT: Sorry, no reservation found on your given name.

USER: No problem. Thank you for your response.

ASSISTANT: Thank you for opting us.