You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Melissa Lewis.

ASSISTANT: How may I help you?

USER: I would like to change my reservation to new locations, can you help me over that?

ASSISTANT: Sure, please wait for a minute.

USER: Sure, take your time.

ASSISTANT: Based on your request there is no reservation with your name in  our database.

USER: It's ok, thanks for your information.

ASSISTANT: It's my pleasure.