You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Patrick Edwards here.

ASSISTANT: How can I help you?

USER: Can you change my flight ticket reservation?

ASSISTANT: Patrick Edwards, I am here to help you for this. let me check your reservation status in our database.

USER: Sure.

ASSISTANT: Sorry for inconvenience, no reservation is found with your criteria.

USER: That is not a problem. Thanks for your help.

ASSISTANT: Thank you very much for contacting our agency.