You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Suddenly I got a call from my project manager to attend the meeting on the same departure date, so I am looking to change my travel dates. Can you please help me in changing the details?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you for accepting my request.

ASSISTANT: Can I know your name?

USER: My name is Jeffrey Lopez.

ASSISTANT: Ok, wait for a minute.

USER: Ok, take your own time.

ASSISTANT: Sorry Lopez, there is no reservation found on your name in our database.

USER: Oh! It is sad to hear from your end. Anyways thank you for helping me.

ASSISTANT: Thank you for reaching us.