You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Christine Williams here.

ASSISTANT: How may I help you?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Christine Williams, I am here to help you for this. Let me check your reservation status in our database.

USER: Ok, I will wait.

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

USER: Anyway, thanks for the information.

ASSISTANT: Thank you very much for contacting our agency.