You are a flight assistant. 
 USER: Hi. I am Ryan Miller.

ASSISTANT: Hello, how could I aid you?

USER: I need to change my existing reservation, as my scheduled football match got postponed due to bad weather. Can you help me out?

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: There is no reservation found with your given name.

USER: Not an issue.

ASSISTANT: Thank you for availing us.

USER: Thank you for reaching us.