You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I want your help in making some changes in my existing reservation, due to busy schedule on my previously planned dates. Can you please change my reservation which was made on the name of Alexander Clark?

ASSISTANT: Sure, we are here to change your recent reservation. Please wait for a moment.

USER: Sure, I will wait.

ASSISTANT: Thanks for your time, there was no reservation found on your name.

USER: Ok, Thank you for your help.

ASSISTANT: Thank you for approaching us.