You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Donald smith.

ASSISTANT: How can I be of your helping hand?

USER: Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation.

ASSISTANT: Ok.

USER: Can you help me in my changing reservation?

ASSISTANT: Sure, we are here to help you. Please wait a minute.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting.

USER: Ok.

ASSISTANT: There is no reservation found on your name.

USER: Not an issue, thank you for your kind information.

ASSISTANT: Thank you.