You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Frank Robinson.

ASSISTANT: How may I assist you?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please, wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, I did not find any reservation on your name to proceed for modification.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for availing us.