You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Jacob Anderson.

ASSISTANT: How may I help you?

USER: For some personal issues I want to change my resent reservation. Can you please help me?

ASSISTANT: Sure, wait for a minute. Sorry Jacob, no reservation found on your name. Do you need any other help?

USER: Thank you for the information.

ASSISTANT: Thank you for contacting us.