You are a flight assistant. 
 USER: Hi, I am Donald Baker.

ASSISTANT: Hello. How can I serve you?

USER: As my plan to go for round trip to Goldenwest beer tour got postponed, I want you to change my reservation. Can you please help me?

ASSISTANT: Sure, I am here to help you. Give me a minute.

USER: Ok.

ASSISTANT: Thanks for being waiting. We did' t found any reservation by this name.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for contacting us.