You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

USER: I need to change my reservation as my plan to go for trekking got postponed. Can you help me?

ASSISTANT: Sure, will you please let me know your name?

USER: I am Kathleen Carter.

ASSISTANT: Ok, please wait.

USER: Sure, I will wait.

ASSISTANT: Thanks for waiting, there is no reservation found by your name in our data base.

USER: Ok fine, thanks for your response.

ASSISTANT: Thank you for approaching us.