You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Frank Smith.

ASSISTANT: How may I assist you today?

USER: I am planning to change my reservation to another destination, so can you help me to change my reservation?

ASSISTANT: Sure, I will try to help you to change that reservation, please wait for a minute.

USER: Ok.

ASSISTANT: Sorry, I could not find any reservation with your name in our database.

USER: That's ok, thank you for your help.

ASSISTANT: My pleasure.