You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How may I aid you?

USER: I just want to change an existing reservation due to my leave was not approved. Can you help me with this?

ASSISTANT: Sure, may I know your good name?

USER: I am Dennis Martinez.

ASSISTANT: Can you please wait for a minute?

USER: Ok.

ASSISTANT: There is no reservation found ith your name to change.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.