You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Frank Hill.

ASSISTANT: Can you please tell me how may I help you?

USER: Can you help me in changing my recent reservation?

ASSISTANT: Sure, I am here to help you in changing the ticket details.  Can you please wait a minute?

USER: Sure.

ASSISTANT: Sorry to inform you that, there is no reservation found with your name to change the ticket details.

USER: Ok, No issues. Thank you.

ASSISTANT: You are welcome. Thank you for approaching us.