You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I want to change my existing reservation due to some technical issues.

ASSISTANT: Ok.

USER: Can you help me in doing that?

ASSISTANT: Sure, may I know your name please?

USER: Thank you. I am Elizabeth Miller.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry Elizabeth Miller, no reservation was found on your name in the database.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.