You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Brian Taylor.

ASSISTANT: How may I help you?

USER: I need your help in changing my existing reservation as my plan to go for holiday trip got postponed. Can you help me?

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

USER: Thank you, I will wait for your response.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for approaching us.